If you have diabetes and play sports, discover how to optimize your nutrition to better manage your blood sugar while boosting your performance. This guide explains how to adapt your carbohydrate intake, choose the right isotonic drink, monitor your blood sugar, and recover properly after exercise—all to combine sports and health with peace of mind.
The different types of diabetes
Diabetes is a disease in which blood sugar (glucose) remains too high because the body no longer manages insulin properly. Insulin is a hormone produced by the pancreas that helps glucose enter cells to be used as energy.
There are 3 main types of diabetes:
Type 1 diabetes
-
The pancreas no longer produces any insulin. Without insulin, glucose remains in the blood. Blood sugar levels become very high, causing fatigue, thirst, and rapid weight loss.
-
It is an autoimmune disease: the immune system destroys the cells that produce insulin.
-
It often develops in children or young adults.
-
Requires lifelong insulin injections.
Type 2 diabetes
-
The pancreas still produces insulin, but the body resists it (insulin resistance). It is the most common type (90% of cases).
-
It mainly affects adults and is often linked to an overly rich diet, lack of physical activity, being overweight, or heredity.
-
It is often controlled first through diet and exercise, then sometimes with medication or insulin.
Type 3 (gestational) diabetes
-
Develops during pregnancy because the mother's hormones make insulin less effective.
-
It often disappears after childbirth but increases the risk of developing type 2 diabetes later.
-
Requires strict monitoring to avoid complications for the mother and baby.
Diabetes, sports, and carbohydrates during physical activity
Regular physical activity improves insulin sensitivity, strengthens the heart, and helps better control blood sugar levels in the long term. However, because exercise greatly increases energy expenditure and draws on glucose reserves, it is crucial to adapt your diet to maintain good blood sugar balance while staying at your best.
How many carbohydrates should you consume during exercise?
Carbohydrates are the main fuel during moderate- to high-intensity exercise. Here are our recommendations:
- For 1 to 3 hours of activity: 30 to 60 g of carbohydrates per hour
- Over 3 hours: Up to 90 g per hour
Mix different types of carbohydrates (glucose, maltodextrin, and fructose) for better absorption and fewer digestive issues.
Our practical tips:
- Space out your intake: Take 10 to 20g of carbohydrates every 15-20 minutes to avoid sharp blood glucose fluctuations. Our energy gels and our Mulebar energy fruit purées are perfect for this, as they have truly resealable caps that prevent leaks.
- Example: 500ml of isotonic drink + an energy gel will provide approximately 50g of carbohydrates per hour.
- Ideal timing: Start eating after 45 minutes of exercise, then continue every 15-30 minutes.
Note: Always test your nutrition strategy during training before a competition. Carefully record your intake, blood glucose levels, and how you feel - this is the best way to find what works for you as an athlete with diabetes.
Hydration and electrolytes for physical activity
Even mild dehydration (2% of body weight) reduces your performance by 20% and disrupts your blood glucose levels. Drink 500 to 650ml per hour when it is hot or during prolonged exercise. Don't forget electrolytes (sodium, potassium...) which help replace the mineral salts you lose through sweating.
The isotonic drinks are particularly suitable: they provide carbohydrates and electrolytes. This is the perfect combination for good blood glucose control during exercise.
Blood glucose monitoring and safety during sports
Our recommended protocol:
- Measure your blood glucose 15-30 minutes before exercising
- Check every 30-60 minutes during the activity
- If your blood glucose falls below 90mg/dL: take 15-30g of fast-acting sugar, then wait 15-30 minutes before continuing
A few essential precautions:
- Wear a bracelet indicating that you have diabetes
- Inform your training partners
- Always carry: fast-acting sugar, your blood glucose meter, and your doctor's contact details
Important: Any change to your insulin treatment must be approved by your medical team. This will allow you to continue your physical activity safely and enjoyably.
Carbohydrates and sports drinks for diabetes
Choosing a suitable sports drink has a direct impact on your digestion, performance, and blood sugar balance. Whether hypotonic, isotonic, or hypertonic, each type corresponds to specific durations and intensities of exercise. Understanding these differences helps you better manage your carbohydrate intake, adjust your insulin, and maintain regular physical activity without blood sugar imbalances or excessive fatigue.
Choosing a drink for physical activity
Isotonic drinks, with their 6 to 8% carbohydrate concentration, have an osmolality similar to that of blood. They pass quickly through the stomach for optimal hydration. This characteristic provides a steady energy supply while avoiding digestive problems, making this drink the ideal choice for efforts lasting more than an hour. It facilitates blood sugar management because the amount of carbohydrates remains easy to calculate and incorporate into your treatment.
Our range of Mulebar isotonic sports drinks combines three sources of carbohydrates (maltodextrin, sucrose, and fructose) to maximize intestinal absorption and provide up to 90g/h during prolonged efforts. They also contain BCAAs to protect muscles, bicarbonates to counter acidity, and antioxidant vitamins (C, E, zinc) essential for protecting your health during physical exertion.
Isotonic, hypotonic, or hypertonic drink?
Carbohydrate concentration determines the absorption rate and therefore the optimal use of each drink: hypotonic (<4%) for rapid hydration during brief activities, isotonic (6-8%) for sustained efforts lasting more than an hour, and hypertonic (>8%) mainly for recovery or preparation before a competition.
For a person with diabetes, this distinction is particularly useful:
- Hypotonic drinks for yoga or gentle exercise
- Isotonic drinks for prolonged running or cycling
- Hypertonic drinks only after exercise or during the preparation phase
This progressive approach helps prevent blood sugar spikes, facilitates insulin adjustment, and integrates smoothly into treatment while optimizing athletic performance.
| Drink type | Carbohydrate concentration | Ideal use | Benefits for diabetes |
| Hypotonic | <4 % | Efforts ≤60 min, light recovery | Rapid hydration, low sugar content |
| Isotonic | 6–8 % | Efforts >60 min, moderate to intense | Balance hydration and energy, precise carbohydrate calculation |
| Hypertonic | >8 % | Recovery, pre-event | Controlled glycogen replenishment, post-exercise only |
Always take the time to read the labels to determine the precise amounts of carbohydrates, sodium, and fiber. Powdered versions offer greater flexibility: you can adjust the dilution according to the outdoor temperature and your personal tolerance. Then remember to accurately include these carbohydrate intakes in your tracking for increasingly precise blood glucose management.
Natural products and digestive tolerance
All our Mulebar products (bars, fruit compotes, and drinks) are made from natural ingredients, often organic and vegan. This commitment ensures better digestion, supports long-term intestinal health, and simplifies blood glucose management—an important advantage during prolonged exertion, when digestive comfort is crucial for performance.
However, be mindful of potential allergens (peanuts, gluten, milk, etc.). Always test any new product during training to observe your blood glucose response and adapt nutrition to the patient's treatment. This rigor will make blood glucose management your ally, allowing you to pursue your passion for sport with complete peace of mind.
Recovery, sports, and carbohydrate management
The moments immediately following physical exertion represent a valuable opportunity to replenish your glycogen stores and stabilize your blood glucose levels. This metabolic window lasts approximately thirty to sixty minutes, while your body's increased sensitivity may persist for up to two hours. To make the most of it, implement a nutritional strategy combining carbohydrates, protein, and electrolytes, thereby optimizing post-exercise recovery and effectively preparing for your next training session.
Take advantage of the metabolic window
Immediately after physical exercise, your muscles become particularly sensitive to insulin and rapidly absorb glucose and the amino acids needed to replenish glycogen and regenerate muscle fibers. This increased sensitivity enables people with diabetes to reduce their insulin doses and prevent hypoglycemia, provided they carefully follow their doctor's recommendations.
- Carbohydrate dosage: consume between 1 and 1.2g of carbohydrates per kilogram of body weight per hour during the first three hours of recovery, which represents 70 to 84g for a cyclist weighing 70kg.
- Protein intake: consume 20 to 40g of protein within thirty minutes of finishing physical activity to limit muscle catabolism and promote fiber repair.
- Optimal ratio: aim for a carbohydrate-to-protein ratio of approximately 3:1 to minimize blood sugar fluctuations and effectively support recovery.
- Essential electrolytes: include at least 300mg of sodium and 300mg of potassium in your recovery drink to compensate for losses caused by sweating and maintain muscle function.
Monitor your blood sugar regularly every thirty to sixty minutes, as increased insulin sensitivity maintains a risk of hypoglycemia for several hours after physical exertion. Carefully record these measurements, adjust your nutritional intake and treatment in collaboration with your healthcare team, then gradually refine your post-exercise recovery strategy.
Which Carbohydrates Should You Have After Physical Activity?
Immediately after physical exercise, choose carbohydrates with a medium or high glycemic index to quickly replenish your muscle and liver glycogen stores. Dried fruits such as dates or apricots, compotes, and isotonic drinks are excellent sources of readily available energy. Bars made with brown rice syrup and rolled oats complement this intake while providing fiber and micronutrients beneficial to your health.
To fully leverage the metabolic window, spread your intake over the first hour of recovery. Start, for example, with a sweet potato-orange-carrot energy compote providing 32g of carbohydrates, then twenty-five to thirty minutes later, add 20g of protein to maintain the optimal 3:1 ratio. This gradual approach helps limit blood sugar spikes and makes it easier to adjust your basal insulin or bolus doses according to your treatment.
Planning Your Recovery with Diabetes
Balancing sports activities with type 1 or type 2 diabetes requires careful planning of your nutritional recovery. Always prepare your post-exercise snacks in advance: electrolyte drinks, easy-to-carry applesauce, protein bars, and a source of fast-acting glucose to deal with possible hypoglycemia. This organization considerably reduces decision-making stress and ensures optimal nutritional intake, thereby safeguarding your health and effectively supporting every adapted physical activity session.
To deepen your understanding of glycogen’s role in sports performance and nutrition, consult our resource detailing the glycemic index, glycemic load, and suitable refueling techniques: optimize your reserves while managing your blood glucose.
Frequently asked questions
Is exercise good for someone with diabetes?
Absolutely! Regular physical activity significantly improves insulin sensitivity and helps stabilize blood glucose in people with diabetes. Whether you have type 1 or type 2 diabetes, exercise also reduces cardiovascular risks. However, before starting intense sports activities, consult your doctor and a nutritionist. They will help you adjust your treatment and diet to avoid episodes of hypoglycemia during exercise.
Does diabetes affect athletic performance?
With good diabetes management, nothing prevents you from excelling in sports! Many diabetic athletes even perform in demanding endurance disciplines. The key? Rigorous blood glucose monitoring, an appropriate carbohydrate intake (especially before exercise), and precise treatment adjustments. A balanced diet—rich in fiber, fruit, vegetables, and protein—is just as crucial for maintaining stable blood glucose levels and promoting recovery.
Does blood glucose increase after exercise?
Yes, but it depends on the type of activity! After intense physical exertion (sprinting, weight training...), adrenaline can cause a temporary increase blood glucose by stimulating the release of glucose from the liver. This normal phenomenon simply requires increased monitoring. In contrast, moderate endurance activities (walking, cycling...) generally lower blood glucose. The patient must then adjust their treatment, plan a carbohydrate snack, and carry fast-acting glucose in case of hypoglycemia.
