Eat, Then Exercise—or Exercise First? In Type 1 Diabetes, the Order May Matter

From diabetesincontrol.com

For people with type 1 diabetes, exercise is rarely as simple as choosing a workout and getting started. Food, insulin, glucose trends, and workout intensity can all change what happens next. New research on exercise timing in type 1 diabetes adds another piece to that puzzle. A randomized crossover trial found that glucose responses differed depending on whether exercise occurred in a post-absorptive state or after a meal, when insulin on board was higher. The results suggest that what happens before exercise may be nearly as important as the workout itself.

Why Exercise Timing in Type 1 Diabetes Matters

Exercise can produce very different glucose responses in people with type 1 diabetes. Moderate aerobic activity often lowers glucose because working muscles rapidly use glucose for energy. In contrast, intense intervals can sometimes produce a smaller decline or even a temporary rise as stress hormones increase glucose production.

However, exercise type is only part of the story. The amount of circulating insulin also matters. After a meal and mealtime insulin dose, insulin on board may remain substantial when exercise begins. As a result, muscle glucose uptake can combine with insulin action and create a sharper glucose decline.

This is why the timing of exercise can matter for people with type 1 diabetes. Two identical workouts may produce different glucose patterns depending on their relationship to food and insulin.

The American Diabetes Association notes that glucose responses can vary with starting glucose, exercise intensity, duration, and insulin adjustments. Diabetes in Control has also reviewed how different workouts affect glucose in type 1 diabetes.

What the Randomized Crossover Trial Found

The 2026 randomized crossover trial published in Diabetologia included 20 physically active adults with type 1 diabetes. Each participant completed four 25-minute cycling sessions. Researchers compared high-intensity interval exercise, or HIIE, with continuous moderate-intensity exercise under both post-absorptive and post-meal conditions.

Importantly, the exercise sessions were matched for mechanical load. The interval sessions alternated one-minute bouts at 100% of maximal aerobic power, while continuous exercise was performed at 50%.

Meal state clearly influenced the response. During exercise, capillary glucose fell less in the post-absorptive state than after a meal. Glucose also declined less during HIIE than during continuous moderate exercise. Moreover, the difference between interval and continuous exercise was strongest in the post-absorptive state.

The average glucose change was approximately -0.72 mmol/L during post-absorptive HIIE compared with -1.73 mmol/L during post-absorptive continuous exercise. After a meal, declines were larger at -2.33 mmol/L for HIIE and -2.61 mmol/L for continuous exercise.

Notably, the differences extended beyond the workout. During the following 24 hours, participants spent less time below 3.0 mmol/L after HIIE than after continuous exercise after researchers adjusted for carbohydrate intake and insulin doses. The study abstract is available through PubMed.

Insulin on Board and Exercise Intensity

Why did eating first make such a difference? Insulin on board is a likely contributor.

During the post-meal sessions, participants had higher circulating insulin. Exercise itself increases glucose uptake by working muscles. Therefore, adding significant insulin action can accelerate the movement of glucose out of the bloodstream.

High-intensity intervals create a different hormonal environment. Catecholamines and other counterregulatory hormones can stimulate the liver to release glucose. Consequently, intense exercise may partly offset the glucose-lowering effect seen during steady aerobic activity.

Still, these findings should not be interpreted as evidence that everyone with type 1 diabetes should exercise before eating or switch to HIIT. The study was small, involving only 20 physically active adults. Individual responses can also vary according to insulin delivery method, fitness, starting glucose, previous activity, carbohydrate intake, and automated insulin delivery settings.

For additional background, Diabetes in Control has discussed target glucose considerations around exercise, emphasizing that exercise type and intensity affect planning.

Applying Exercise Timing Research to Everyday Care

The practical message is personalization rather than finding one ideal time to exercise with type 1 diabetes. Clinicians may want to ask patients not only what exercise they perform, but also when they perform it relative to meals and bolus insulin.

CGM data can make these conversations more useful. For example, patients can compare glucose trends during similar workouts performed under different conditions. Recording meal timing, insulin doses, exercise intensity, and glucose direction may reveal repeatable patterns.

Additionally, patients should be aware that a stable glucose level during exercise does not eliminate the possibility of delayed hypoglycaemia. Increased insulin sensitivity can continue after activity, so post-exercise and overnight monitoring may remain important.

Current diabetes guidance emphasizes individualized carbohydrate and medication adjustments because glycaemic responses to physical activity can vary widely. Therefore, insulin changes should not be based on one study or a single workout.

People experiencing repeated exercise-related hypoglycaemia, unexplained hyperglycaemia, or difficulty adjusting insulin around workouts should discuss their patterns with their diabetes care team. Personalized medical guidance can also be found through Healthcare.pro.

Conclusion

For people with type 1 diabetes, when exercise happens can be just as important as the type of activity. Meal state, insulin on board, and workout intensity can interact to produce meaningfully different glucose responses.

In this randomized crossover trial, high-intensity interval exercise produced a smaller glucose decline than continuous moderate exercise, particularly when performed in the post-absorptive state. Meanwhile, exercising after a meal was associated with larger glucose declines across both exercise types.

These findings reinforce a practical lesson: the same workout does not always produce the same glucose response. Tracking exercise timing alongside insulin, meals, and CGM trends may help clinicians and patients develop safer and more predictable exercise strategies.

FAQs

Does exercising after a meal lower glucose more in type 1 diabetes?

In this study, glucose declined more during post-meal exercise than during exercise in the post-absorptive state. However, individual responses can vary considerably.

Is HIIT safer than moderate exercise for preventing hypoglycaemia?

The trial found smaller glucose declines and less time below 3.0 mmol/L after HIIE compared with continuous moderate exercise. However, that does not establish HIIT as universally safer for every person with type 1 diabetes.

Why does insulin on board matter during exercise?

Insulin promotes glucose uptake, while exercising muscles also consume more glucose. When substantial insulin remains active, these effects can combine and increase the likelihood of falling glucose.

Should people with type 1 diabetes exercise before eating?

Not necessarily. The best timing depends on insulin therapy, glucose trends, exercise type, fitness, and individual responses. Changes to insulin or exercise routines should be discussed with a diabetes care professional.

Can glucose fall hours after exercise?

Yes. Exercise can increase insulin sensitivity after a workout, so delayed and overnight hypoglycaemia may occur. CGM monitoring and an individualized management plan can help identify these patterns.

This content is not medical advice. For any health issues, always consult a healthcare professional. In an emergency, call 911 or your local emergency services.

https://www.diabetesincontrol.com/exercise-timing-type-1-diabetes/ 

More moderate to vigorous physical activity could reduce type 2 diabetes risk

From medicalnewstoday.com

• Recent research suggests that higher levels of moderate-to-vigorous physical activity (MVPA) may more effectively reduce the risk of type 2 diabetes compared with lower MVPA levels.
• These findings were strongest in adults 62 years or younger, though older adults still saw benefits in reducing the risk.
• Experts advise that aerobic exercise and resistance training can be beneficial in helping reduce the risk of type 2 diabetes and manage prediabetes.

Physical inactivity is a known risk factor for type 2 diabetes. There are around 40 million people in the United States with some type of diabetes, and type 2 diabetes accounts for around 90% to 95%Trusted Source of all diabetes cases.

Type 2 diabetes can develop if the body does not make enough insulin or if it does not respond to insulin correctly. Overweight, age, and conditions such as prediabetes and metabolic dysfunction-associated steatotic liver disease (MASLD) are also risk factors.

New research published in August in Diabetes, Obesity and MetabolismTrusted Source suggests that moderate-to-vigorous physical activity (MVPA), in particular, could help reduce the risk of type 2 diabetes in adults.

The researchers examined data from almost 88,000 participants in the UK Biobank. They found that individuals in the lower-MVPA group had twice the relative risk of developing type 2 diabetes compared with those in the higher-MVPA group.

The largest relative risk reduction was observed in adults under 63 years of age.

Higher levels of moderate-to-vigorous physical activity could help reduce the risk of type 2 diabetes, according to recent research. GCShutter/Getty Images

Higher MVPA could significantly reduce risk of type 2 diabetes

With a hazard ratio of 2.07, lower MVPA volume was associated with almost twice the risk of type 2 diabetes compared with higher MVPA volume.

The higher MVPA group accumulated a median of 409 minutes of exercise per week. The study authors note that all participants in this group met the World Health Organization (WHO)’sTrusted Source guidelines of at least 150 minutes of moderate aerobic activity per week.

The lower MVPA group accumulated a median of 121 minutes of exercise per week. Around 37% of participants in this group reached the WHO’s minimum recommendation of 150 minutes per week.

Opel Baker, MBChB, general practitioner at the Mayfield Clinic, spoke with Medical News Today about the significance of these findings.

“An HR of 2.07 is clinically meaningful. […] Importantly, this is an observational study, so it shows a strong association rather than proving that lower activity directly caused diabetes,” said Baker, who was not involved in the study.

“Nevertheless,” Baker added, “it reinforces something we see in general practice: physical activity is one of the most powerful and accessible tools we have for improving insulin sensitivity and reducing diabetes risk.”

David Cutler, MD, board certified family medicine physician at Providence Saint John’s Health Center in Santa Monica, CA, who was also not involved in the study, told MNT:

“An HR of 2.07 doesn’t mean that an individual person’s probability of diabetes literally doubles. It means that the rate of developing diabetes was approximately twice as high in the lower-activity group after adjustment.”

He added, “This data reinforces the message that physical activity isn’t merely a treatment for diabetes — it is an important component of diabetes prevention. This is not new information. Regular exercise improves insulin sensitivity, helps control visceral fat, improves skeletal-muscle glucose uptake, and favourably affects lipid metabolism.”

Adults 62 years or younger saw greatest risk reduction

The study found that the relationship between physical activity levels and type 2 diabetes was stronger among younger adults.

Compared with people who had higher levels of MVPA, those aged 62.7 years or younger with lower levels of MVPA were 2.44 times more likely to develop type 2 diabetes.

Among adults aged 62.7 or older with low MVPA, they were 1.65 times more likely to develop the condition.

‘One of the most interesting findings in this study is the impact of age on the benefits of moderate-to-vigorous physical activity,” said Cutler.

“At first glance, the lower HR (hazard ratio) in older participants (1.65 vs 2.44 in younger participants) might suggest exercise is less beneficial in the elderly. But those numbers can be misleading. The authors found that, although the relative association became weaker with age, the absolute difference in diabetes incidence became larger with age. That’s an important clinical distinction.”

Baker also spoke with MNT about these findings.

“What I find particularly interesting is that the relationship wasn’t identical across different age groups. The relative association between lower activity and diabetes risk was stronger in younger participants. […] But that doesn’t mean exercise becomes less important as we age,” he said.

“In fact, the absolute difference in diabetes rates between the more and less active groups became larger with age. It suggests that staying active throughout life may be particularly important because baseline diabetes risk rises with age. It is never too late to become more active,” he added.

Prediabetes management with higher MVPA

The study authors note that higher MVPA volume was associated with a lower risk of type 2 diabetes among people with prediabetes.

Baker said that exercise with prediabetes should be thought of as “management rather than simply prevention.”

He explained that “exercise improves insulin sensitivity, meaning the body becomes better at using glucose. For someone with prediabetes, increasing activity can therefore help bring blood glucose back toward the normal range and reduce progression to type 2 diabetes.”

He added, “The important point is that there isn’t necessarily a completely different exercise prescription for someone with prediabetes. The starting point should be realistic and sustainable, then gradually built up according to the person’s fitness, health, and goals. Strength training is also valuable because maintaining and building muscle helps with glucose disposal.”

Does the exercise type and duration matter?

The research did not focus on the type of exercise. Instead, it looked at the intensity of the workouts, with greater amounts of moderate to vigorous physical activity generally yielding stronger results.

Cutler advises that, “[f]or diabetes prevention, there is good rationale for combining aerobic exercise (brisk walking, cycling, swimming, jogging, hiking) with resistance exercise (weights, resistance machines, bands, body weight exercises).”

He added that “resistance exercise is particularly interesting because skeletal muscle is a major site of glucose disposal. Increasing or maintaining muscle mass and improving muscle insulin sensitivity can therefore be metabolically important.”

The study authors found that participants in the higher MVPA group had a median of 409 minutes of exercise each week, compared with 121 minutes in the lower MVPA group.

We asked Baker how achievable these numbers are for the average person compared with the WHO’s recommendation of 150 to 300 minutes of moderate aerobic activity per week for optimal health and well-being.

“I wouldn’t want people to look at the 409-minute figure and think they have failed if they aren’t exercising for nearly seven hours a week. That was the median activity level of the higher-MVPA group in this particular study, not a recommended target,” Baker explained.

“The researchers also defined their higher and lower activity groups according to the age-specific median, rather than using 409 minutes as a clinical threshold. For the average adult, 150 minutes of moderate activity a week remains a very sensible and achievable target, alongside muscle-strengthening activity on at least two days."

https://www.medicalnewstoday.com/articles/more-moderate-to-vigorous-physical-activity-could-reduce-type-2-diabetes-risk 

6 Ways to Reduce Insulin Resistance for Better Blood Sugar, According to Dietitians

From eatingwell.com

These lifestyle strategies are small but mighty! 

KEY POINTS

• Eat more fibre-rich foods to help improve insulin sensitivity and support blood sugar balance.
• Engage in regular exercise to help muscles use glucose efficiently and boost insulin sensitivity.
• Prioritise sleep, reduce stress and gradually lose weight to help reverse insulin resistance.

Insulin resistance is an often-overlooked condition that is a precursor to a host of metabolic conditions, especially prediabetes and diabetes.

Centers for Disease Control and Prevention. About Insulin Resistance and Type 2 Diabetes.

The good news is there are ways to protect against and even reverse insulin resistance. That’s important because cells rely on insulin around the clock to effectively use glucose for fuel. Plus, reversing insulin resistance can reduce your long-term risk of many chronic illnesses.

Read on to learn all about insulin resistance, how it impacts your blood sugar levels, and the best ways to naturally prevent it.

1. Eat More Plants

Eating more whole, fibre-rich plant foods like beans, lentils, whole grains, leafy greens, vibrant veggies, nuts and seeds is one of the best things you can do to help your body use insulin more efficiently, says Los Angeles-based dietitian Vandana Sheth, RDN, CDCES, FAND. “These foods offer a powerful combination of fibre, antioxidants and anti-inflammatory compounds which help with blood sugar balance and support insulin function,” says Sheth. 

What makes fibre so special? “Dietary fibre slows down the digestion process,” says Dru Rosales, M.S., RD. “As a result, it helps to control blood sugar and cholesterol levels, both of which lead to improved insulin sensitivity.” 

2. Reduce Saturated Fat 

“Excess dietary fat, particularly saturated fat, breaks down into fatty acids and accumulates in your muscle and liver,” says Lauren Plunkett, RDN, LD, CDCES, a registered dietitian and certified diabetes care and education specialist. “These fatty acids stick together and harden the cell wall, which causes insulin resistance.” That, in turn, prompts glucose to accumulate in the bloodstream, resulting in high blood sugar.

High-saturated-fat foods include red and processed meats, full-fat dairy, cream, butter, desserts, baked goods and fried foods. While you don’t have to avoid these foods entirely, it’s wise to have a goal to limit saturated fat to less than 10% of your daily calories. “Intakes greater than this have been shown to increase LDL cholesterol, which is a risk factor for heart disease and type 2 diabetes,” says Rosales.

3. Move Your Body Daily 

There are several ways physical activity helps with insulin resistance. Working muscles need lots of glucose for fuel. When you exercise, your muscles take up glucose and remove it from the bloodstream, whether insulin is available or not. In addition, exercise makes muscle cells more sensitive to insulin. And it helps you build more muscle tissue overall.

What’s the best exercise? The answer is the type you enjoy and can stick to. Aim for 150 minutes of moderate aerobic activity each week, or bump the intensity up to vigorous and shoot for 75 minutes per week. This might look like brisk walking, swimming, biking or jogging. Plus add two days of resistance exercise and some stretching. 

4. Prioritize Sleep 

“Research has shown that sleeping less than the recommended seven hours per night is associated with insulin resistance,” says Rosales. “In addition, [poor] sleep duration and quality are both considered risk factors for type 2 diabetes.”

If you’re not getting seven hours per night, start by going to bed 15 minutes earlier than usual. Once you get acclimated to that, increase by 15 minutes until you hit your goal.  

5. Be Mindful of Stress 

Not all stress is bad, but too much chronic stress can increase insulin resistance. Why? Chronic exposure to stress encourages your body to produce higher levels of stress hormones like cortisol, which can impair glucose metabolism. If this becomes chronic, it can lead to insulin resistance. And when excess stress impairs sleep, it can throw you into a vicious cycle, making things even worse. 

To reduce stress, start small by incorporating activities you enjoy doing. For example, you may try journaling, deep breathing, walking, art, prayer, meditation, yoga, tai chi or any other mindfulness activities that you find soothing.  

6. Consider Weight Loss 

If you are living with overweight or obesity, losing even a small amount of your body weight can increase your insulin sensitivity and help prevent type 2 diabetes, says Rosales. Weight loss is so powerful that research has found that people at high risk for diabetes may reduce their chances of developing diabetes by 58% after losing 5% to 7% of their body weight.

Of course, weight loss can be difficult, especially if you’ve tried to lose weight before only to gain it back. It can be helpful to think “slow and steady” and understand that plateaus will happen. When they do, consider reaching out to a registered dietitian or certified diabetes educator, who can help you find realistic, lasting lifestyle changes to continue to lose weight and keep it off. 

What Is Insulin Resistance? 

Insulin is a hormone produced by your pancreas that helps move glucose from your blood into your muscles, fat cells and liver for energy. However, sometimes, things like weight gain, genetics or a sedentary lifestyle can cause our cells to undergo changes that impair their ability to use insulin effectively. In response, the pancreas produces even more insulin, leading to a vicious cycle known as insulin resistance. Over time, if this cycle becomes chronic, the insulin-producing cells of the pancreas become overworked and lose function, potentially leading to prediabetes or even diabetes.

The encouraging news is, it is often possible to reverse insulin resistance with the diet and lifestyle changes we’ve shared. If you’re not sure where to start, try the tip you find easiest to manage. Then, once you’ve mastered that, try another. Little by little, these small changes can yield meaningful results.

Our Expert Take

You can naturally prevent or reduce insulin resistance with diet and lifestyle changes. Strategies like eating more fibre and less saturated fat, exercising, getting adequate sleep, reducing stress and losing weight—if indicated—can all help your body use the insulin it makes more efficiently. 

These strategies are so effective that when done consistently, they may even reverse insulin resistance, which can prevent, delay and treat diabetes. And it’s never too late to get started. Stack small, consistent changes one day at a time to stay motivated, and reach out for professional help for support and guidance if you feel stuck.

https://www.eatingwell.com/ways-to-reduce-insulin-resistance-for-better-blood-sugar-12077246

Diabetes can affect how your body reacts to exercise—a trainer explains how to adapt your workouts to manage blood sugar levels and work out safely

From health.yahoo.com

Not knowing what to lift or how hard to push yourself during a workout is a common issue for those new to exercise.

But it's all the more daunting for the 40 million or so Americans living with diabetes.

People with this chronic condition—representing around 12% of the US population according to the CDC—can find their blood sugar levels are too high because their body is unable to produce enough insulin or can't use it effectively.

While exercise can improve insulin sensitivity, promote glucose metabolism and maintain blood sugar levels at a healthy level, too strenuous a workout could trigger glucose levels to rise or drop rapidly, leading to potentially dangerous side effects.

Despite these implications, certified strength and conditioning specialist Garett Reid of the BetterMe app says there is "no inherent reason" why someone living with the condition can't train exactly the same as anyone else.

"You just need to take adequate precautions and learn how your body responds to exercise over time," he says.

Credit: Getty Images/ Ljupco

Reid was speaking to Fit&Well as BetterMe has recently launched a series of workouts for people with diabetes in collaboration with charity Diabetes UK.

Here, the NSCA-certified trainer outlines three ways people living with type 1 or type 2 diabetes can get started with exercise or modify their usual routine to train safely.

Three ways you should exercise differently with diabetes

Before outlining how people with diabetes should modify their approach to exercise, Reid says it's imperative to remember that this condition can affect everyone differently.

"One thing that should be very clear is that everything we say is a guideline," he says.

"Diabetes is a very personalized condition, whether you have type 1 or type 2, or how far along you are, so everything should be very personalized."

But the general gist is to "approach training to see how your body adapts and that generally means lower intensity and shorter sessions."

1. Take it slow for the first month after your diagnosis

Long-term, Reid says people with diabetes "do not intrinsically have to train differently down the road" so long as they take it slow when getting back into exercise.

Reid tells his clients to take it slow and exercise caution, especially in the first month.

Credit: Getty Images

"You should be a little bit more careful with everything," he says.

"Your sessions should be a little bit shorter. A little bit less intensity. A little bit less volume. And your main focus should be on testing your blood sugars."

An optimal session would be no more than half an hour with plenty of rest between exercises.

"Keep sessions short—no more than 30 minutes. Longer workouts of 60 or 90 minutes have more of a dramatic effect on glucose levels," he says.

2. Test before, test after and test later

Not everyone will need to regularly test their blood sugars. For example, some people with type 2 diabetes will not be on glucose-lowering medication.

But if you've been told you need to, regularly monitoring your blood sugar levels 30 minutes before, immediately after exercise and two-to-four hours later will help build a picture of how your body responds to exercise, Reid continues.

• 30 minutes before: to determine if your levels are safe

• Immediately after: to monitor the immediate effect of the workout

• Two-to-four hours later: to see how your levels have settled

BetterMe's plan incorporates regular reminders via voice prompts during its workouts to check blood sugar levels so users can adjust intensity or take action if needed.

Tracking these fluctuations and writing down your results will allow you to recognize trends in how your body responds to exercise.

Over time, the accumulation of this knowledge is what allows you to increase your training intensity and duration.

"Resistance training can cause a spike in blood sugar levels when glucose is released into the bloodstream," explains Reid.

Whereas "prolonged cardio is more likely to decrease glucose levels."

Testing two-to-four hours after finishing your workout helps you avoid "making brash decisions," he says, meaning you'll know if your levels have returned to normal naturally or if you need to start making adjustments with insulin or dietary choices.

You may also need to continue to check them for up to 24 hours after exercise, as your body may be more sensitive to insulin, increasing your risk of delayed hypoglycaemia.

"Dangerously low blood sugar is an exception," notes Reid.

"If your blood glucose falls too low during or immediately after exercise, stop exercising, consume 15–20g of fast-acting carbohydrates, wait about 15 minutes, then recheck your blood glucose. Only resume exercise once your levels have recovered and you feel well."

3. Prioritize strength training—but don't neglect cardio

Both strength training and cardio workouts can improve insulin sensitivity and glucose metabolism.

However, strength training is generally regarded as especially beneficial for people with diabetes because it helps increase lean muscle mass which can aid glycogen storage.

"About 80-85% of glycogen, the stored form of glucose, is stored within your muscles," says Reid. "So having more muscle mass means you don't have as much glucose running through your blood."

That said, cardio training, including walking, running, cycling and swimming, can improve muscle function, helping make that muscle "work even better and be even more sensitive to insulin."

Credit: Getty Images

Reid says a good beginner plan for someone with diabetes should be built around a full-body strength workout, repeated two to three times per week, focusing on using one compound movement per body part.

For example, a squat for the legs, chest press for the chest, bent-over row for the back and shoulder press for the shoulders.

"Generally, you can use free weights or machines," he says.

"Start off with two sets per exercise, eight to 12 reps per set, and stop three to four reps before failure to keep intensity low," he says.

Take it slow, see how your blood sugar levels react, and build gradually from there as you start to learn how your body responds to exercise.

How to progress safely over time

As you become accustomed to each workout and learn how your body responds, Reid says you can start to cautiously increase the duration and intensity of these sessions.

However, you should adopt the same precautions outlined above whenever you try a new form of training.

"If you only strength trained for a few months, then planned to add prolonged steady-state cardio, follow the same precautions because your body might respond differently," he says.

"Ideally your body's [response to exercise] will have improved but it's still good to note and be mindful of how it reacts to a different stimulus.

"You may have adapted to strength training but you'll still need to monitor how your body reacts to cardio."

Ultimately, the benefits of exercise for people with diabetes far outweigh the risks, but it's always best to consult a healthcare professional first to fully understand what is suitable for your individual needs.

https://health.yahoo.com/conditions/endocrine/diabetes/articles/diabetes-affect-body-reacts-exercise-040000107.html