Weinig energie tijdens het afvallen? Dit kun je er tegen doen!

Low energy while losing weight? Here's what you can do!

Geschreven door: Ebrina van der Bijl

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Gepubliceerd op:

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Leesduur: 8 min

When you lose weight, you might expect to have more energy, but many people notice the opposite: they feel tired, sometimes even exhausted.

Fatigue while trying to lose weight can be quite discouraging. It's especially difficult to stick to your goals and diet when you're tired.

Fortunately, there is a lot you can do to prevent this.

Read on to discover what you can do to stay energized and why you might feel sluggish and tired when losing weight.

Calorie restriction, nutrient deficiencies, and hormonal changes cause fatigue during weight loss, especially with crash diets or very low intakes.

Prevent listlessness by losing weight gradually, with a nutritious diet, stable blood sugar levels, sufficient sleep and strength training.

Natural supplements such as Berberine, green tea and B vitamins can maintain energy levels and further support weight loss.

Why do you experience fatigue when losing weight?

These are the 6 main reasons why you might feel tired while losing weight:

1. Fewer calories, less energy

When you eat fewer calories, your body simply gets less fuel.

This can lead to fatigue, especially if you suddenly eat much less than you are used to.

2. Deficiency of important nutrients

Diets can sometimes lead to deficiencies in essential nutrients such as iron, B vitamins, vitamin C , zinc, and magnesium, especially when the diets are not properly balanced.

These deficiencies can significantly reduce your energy levels, resulting in fatigue.(1)

3. A low-carb diet

With a low-carb diet, you may experience more fatigue in the first few weeks because your body is adapting and has to get energy from fats instead of carbohydrates.

This can temporarily lower your energy levels.(2)

4. Fluctuations in your blood sugar

When you lose weight, insulin production decreases because your body needs to store less glucose. This can lead to fluctuations in your blood sugar levels, with peaks and troughs in your energy levels.

It is good to know that this effect is often temporary, because after a while your body adapts to it and starts to regulate blood sugar better.(3)

5. Hormonal changes

In addition to insulin, the balance of other hormones in your body also changes when you lose weight.

Leptin, the satiety hormone, drops, signaling your body to conserve energy. This results in less energy and you feel tired more quickly.

Thyroid hormones also play a role in your energy use: when you lose weight, your thyroid gland can become less active, leading to less energy.

These hormonal changes can cause fatigue and increased cravings, making it harder to maintain your weight.(4)

6. More exercise, fewer calories

Losing weight is often combined with increased exercise, which is beneficial, but it can also lead to low energy. Exercise increases your energy needs, while you eat less.

Without the right balance, this can cause fatigue as your body struggles to meet both your activities and basic energy needs.

7. Loss of muscle mass (especially due to crash diets)

Especially with crash diets, you lose a lot of muscle mass in addition to fat, because when there is a sudden energy shortage, your body breaks down proteins from muscles for extra energy.

And less muscle mass means your metabolism slows down, because muscles use energy even at rest.

So, with less muscle, you burn fewer calories, which lowers your energy levels and can lead to feeling exhausted, especially if you're already getting few nutrients.(5)

Tips for more energy while losing weight

The good news is that most causes of fatigue when losing weight are temporary and there is a lot you can do to feel more energetic.

1. Avoid crash diets

It's important not to cut calories too much. Generally, you can cut back between 300 and 500 calories per day, depending on your activity level (more exercise = more food).

This ensures you lose weight gradually without significantly impacting your energy levels. It's also easier to maintain than so-called crash diets.

2. Pay attention to your nutritional deficiencies

Make sure you get enough of important nutrients:

  • B vitamins : This group of vitamins plays a key role in converting nutrients into energy.
  • Vitamin C: Supports normal energy metabolism.
  • Iron: Contributes to normal oxygen transport in the body, which is essential for the functioning of muscles and the brain, and helps to reduce fatigue.
  • Magnesium: Supports normal energy levels in the body.
  • Zinc: Supports the normal functioning of the immune system and contributes to the reduction of tiredness and fatigue, both mentally and physically.

I recommend you check out our pages on these nutrients to find out how much you need per day and in which foods they are commonly found.

If you have trouble getting all the nutrients you need from your diet, you may consider taking a nutritional supplement.

3. Choose foods with a low calorie density

When eating less, it is extra important that what you eat is rich in essential nutrients.

A low calorie density diet means choosing foods that are low in calories but packed with beneficial nutrients like vitamins, minerals, and fiber.

This helps you give your body everything it needs without quickly consuming too many calories.

Think vegetables, fruits, Greek yogurt, chia seeds, lean meats, and legumes.(6)

4. Eat 4-6 smaller portions and choose fiber-rich foods (low GI)

Eat small portions regularly (4-6 times a day) to prevent your blood sugar from fluctuating too much and choose fiber-rich foods with a low glycemic index (GI).

Foods high in fiber and with a low GI, such as quinoa, brown rice, vegetables and legumes, raise your blood sugar more slowly (than, for example, white pasta, rice, etc.).

This helps keep your blood sugar more stable, so you'll experience fewer energy spikes and dips.(7)

5. Sleep at least 8 hours per night

Sleep is essential for energy. Try to get at least 7-8 hours of sleep every night. Good sleep helps your body recover and prevents you from feeling extra tired.(8)

A regular sleep pattern is also essential for weight loss. Try to go to bed and wake up around the same time every day.

If you have trouble falling asleep, try relaxation exercises or meditation before going to bed.(8)

6. Do strength training 2-3 times a week

Do strength training 2-3 times a week, such as squats, lunges, push-ups, or weight training.

Strength training helps you maintain and build muscle mass, which is important for your energy levels.

Because the more muscle mass you have, the more calories your body burns, even at rest. This is because muscle requires more energy to maintain than fat tissue, which increases your metabolism (the rate at which you burn calories).

A more active metabolism gives you more energy throughout the day.(9)

Supportive supplements for weight loss

In addition to all the above tips, natural supplements can support weight loss and contribute to your energy levels.

Here are 3 examples of powerful nutritional supplements for weight loss:

1. Berberine

Berberine is a bioactive compound from the barberry plant (Berberis) and has been used for centuries in traditional Asian medicine for a variety of health purposes.

In the West, its popularity is growing due to scientific interest in its effects on blood sugar levels, gut health and cholesterol. (10)

Our Berberine Premium supplement contains Rebersa® Berberine: the best berberine extract in the world!

  • 500 mg Rebersa® Berberine per serving (with 97% purity)
  • Helps maintain healthy blood sugar levels*
  • Is good for blood cholesterol levels*
  • Supports the heart, blood vessels and liver*

Please note: Claims marked with (*) are health claims awaiting European approval.

2. Green Tea in Fat Burners

Green tea has also long been a well-known fat-burning aid, making it incredibly popular in natural fat burners. It's packed with antioxidants that protect against free radicals, especially important during weight loss.

Our Natural Fat Burner has been specially developed to support your body during weight loss.

It contains only natural ingredients that have been selected and dosed based on scientific research.

These are the benefits of our natural fat burner with green tea:

  • 480 mg Green tea extract per serving
  • 18-in-1 weight management formula ( including all B vitamins! )
  • No feeling of being rushed or restless
  • Supports fat burning and blood sugar levels
  • Reduces fatigue and supports energy levels

3. Vitamin B complex

Our Natural Fat Burner contains a balanced dosage of all B vitamins .

Prefer a separate supplement? Choose our Vitamin B complex with:

  • All B vitamins in active form
  • Support for mental balance and nervous system
  • Extra strong dose of B12 and safe dose of B6
  • Active folic acid (5-MTHF folate) from Quatrefolic®
Ebrina van der Bijl - Natural Performance

Ebrina van der Bijl

Ebrina is a nutritionist with a deep commitment to healthy eating and a sustainable lifestyle, based in beautiful Portugal. Her passion for natural and organic products is at the heart of her work. With a background in Nutrition & Dietetics and experience in product development and writing, she translates complex scientific information into practical advice for a balanced lifestyle.

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Sources used

  1. Tardy, A., Pouteau, E., Marquez, D., Yilmaz, C., & Scholey, A. (2020). Vitamins and Minerals for Energy, Fatigue and Cognition: A Narrative Review of the Biochemical and Clinical Evidence. Nutrients , 12 (1), 228. https://doi.org/10.3390/nu12010228
  2. Ludwig, D.S., Dickinson, S.L., Henschel, B., Ebbeling, C.B., & Allison, D.B. (2020). Do Lower-Carbohydrate Diets Increase Total Energy Expenditure? An Updated and Reanalyzed Meta-Analysis of 29 Controlled-Feeding Studies. Journal Of Nutrition , 151 (3), 482–490. https://doi.org/10.1093/jn/nxaa350
  3. Farhana, A., & Rehman, A. (2023, July 10). Metabolic Consequences of Weight Reduction . StatPearls - NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK572145/
  4. Trexler, ET, Smith-Ryan, AE & Norton, LE Metabolic adaptation to weight loss: implications for the athlete. J Int Soc Sports Nutr 11, 7 (2014). https://doi.org/10.1186/1550-2783-11-7
  5. Anyiam, O., Rashid, R.S.A., Bhatti, A., Khan-Madni, S., Ogunyemi, O., Ardavani, A., & Idris, I. (2024). A Systematic Review and Meta-Analysis of the Effect of Caloric Restriction on Skeletal Muscle Mass in Individuals with, and without, Type 2 Diabetes. Nutrients , 16 (19), 3328. https://doi.org/10.3390/nu16193328
  6. Robinson, E., Khuttan, M., McFarland-Lesser, I., Patel, Z., & Jones, A. (2022). Calorie reformulation: a systematic review and meta-analysis examining the effect of manipulating food energy density on daily energy intake. International Journal Of Behavioral Nutrition And Physical Activity , 19 (1). https://doi.org/10.1186/s12966-022-01287-z
  7. Zafar, M. I., Mills, K. E., Zheng, J., Regmi, A., Hu, S. Q., Gou, L., & Chen, L. (2019). Low-glycemic index diets as an intervention for diabetes: a systematic review and meta-analysis. American Journal Of Clinical Nutrition , 110 (4), 891–902. https://doi.org/10.1093/ajcn/nqz149
  8. Chaput, J., Dutil, C., Featherstone, R., Ross, R., Giangregorio, L., Saunders, T. J., Janssen, I., Poitras, V. J., Kho, M. E., Ross-White, A., & Carrier, J. (2020). Sleep duration and health in adults: an overview of systematic reviews. Applied Physiology Nutrition And Metabolism , 45 (10 (Suppl. 2)), S218–S231. https://doi.org/10.1139/apnm-2020-0034
  9. Wender, CLA, Manninen, M., & O'Connor, P.J. (2022). The Effect of Chronic Exercise on Energy and Fatigue States: A Systematic Review and Meta-Analysis of Randomized Trials. Frontiers in Psychology , 13 . https://doi.org/10.3389/fpsyg.2022.907637
  10. Ilyas, Z., Perna, S., Al-Thawadi, S., Alalwan, T.A., Riva, A., Petrangolini, G., Gasparri, C., Infantino, V., Peroni, G., & Rondanelli, M. (2020). The effect of Berberine on weight loss in order to prevent obesity: A systematic review. Biomedicine & Pharmacotherapy , 127 , 110137. https://doi.org/10.1016/j.biopha.2020.110137