Keto diet vs high-carb diet: what to choose and for whom
Arguments about keto versus carbs rarely end in consensus, because the right answer depends on the person. A sprinter, an overweight office worker and an ultramarathoner need different strategies. The editorial team has gathered practical criteria to help you understand what to choose for yourself, and where the evidence base gives clear guidance.
Where to start the choice
The first question we advise you to ask yourself is what the main goal of the coming months is. Weight loss, a competition result, gaining muscle mass and simply eating healthily require different priorities. A diet that is ideal for one goal may hinder another, and this is precisely where most disappointments arise.
The second question is the nature of your workload. If your workouts are short and moderate, the need for carbohydrates is small and there is great flexibility of choice. But if you train for hours, do intervals or play team sports, glycogen stores become a limiting factor, and a sharp restriction of carbohydrates will noticeably affect the quality of your work.
The third is food preferences and lifestyle. A diet works only when it can be followed for months. If you love grains, fruit and bread, and family dinners are built around potatoes, keto will require constant struggle. But if it is easy for you to live on meat, fish, eggs, vegetables and nuts, it may even seem simpler.
The fourth is your state of health. Chronic diseases, taking sugar-lowering drugs, pregnancy, kidney or pancreatic disease, a history of eating disorders - all are reasons to discuss any radical dietary changes with a doctor before you start.
Who the keto diet may suit
The keto diet most often proves convenient for overweight people who do not engage in intense sport and who find it hard to control their appetite on a traditional diet. Many note that when carbohydrates are restricted, hunger becomes more predictable and cravings for sweets weaken. This is not magic but a way to naturally eat fewer calories.
The second group consists of enthusiasts of prolonged low-intensity exertion: hiking, ultra-distances at a slow pace, multi-day cycling tours. For them, a high capacity to oxidize fat can be useful, and less dependence on frequent snacks is a practical advantage. However, in this niche the evidence is more at the level of experience than of randomized trials.
The third group is people for whom the ketogenic diet is part of treatment: primarily patients with drug-resistant epilepsy. Here it is used under medical supervision and by clear protocols that differ from the popular keto for weight loss.
At the same time, it is important to understand the limits. At equal calorie intake, keto does not burn fat faster than other diets - this was shown both by metabolic studies and by the year-long DIETFITS. If you do not feel better appetite control on keto, there is no particular reason to choose it specifically for weight loss.
Who needs carbohydrates
Athletes whose performance depends on high intensity - middle-distance runners, rowers, swimmers, footballers, basketball players, combat athletes - gain the most benefit from a sufficient amount of carbohydrates. A study of elite race walkers (Burke et al., 2017) showed that even with intense training, a low-carbohydrate high-fat diet deprived the athletes of an improvement in results.
Carbohydrates are also important for those building muscle mass and training with high volume. Glycogen provides the ability to perform many sets, and carbohydrates after a workout help restore stores more quickly for the next session. Moreover, in a caloric surplus it is much easier to top up energy with porridge or rice than with fats alone.
People with high overall activity - physical work, several workouts a week, active children - usually feel better on a diet with a moderate or high proportion of carbohydrates. Restriction in this case often leads to fatigue and worsening mood and concentration.
Finally, a high-carbohydrate approach is appropriate for teenage athletes and people recovering from injuries or surgery, when an energy deficit and sharp dietary changes are undesirable. Here the priority is sufficient energy, not experiments with metabolism.
| Person's profile | More appropriate approach | Editorial comment |
|---|---|---|
| Overweight, little sport, strong craving for sweets | You can try keto or a low-carbohydrate diet | The main thing is a sustained calorie deficit and food quality |
| Team sports, sprints, intervals | Carbohydrates | Glycogen limits intensity |
| Gaining muscle mass | Moderate-to-high carbohydrates | Easier to reach a surplus and volume |
| Ultra-distances at a slow pace | Individual | Keto adaptation is possible, but carbohydrates at the start are useful |
| Diabetes, taking medication | Only in agreement with a doctor | Risk of hypoglycemia and ketoacidosis |
Intermediate options and periodization
The choice is not necessarily binary. Between strict keto and a high-carbohydrate diet there is a whole spectrum of solutions, which often turn out to be the most practical. For example, a moderately low-carbohydrate diet (100-150 g of carbohydrates per day) provides many of the appetite-control benefits without the restrictions of ketosis.
Athletes increasingly use carbohydrate periodization: fewer carbohydrates on light training days, more on days of key intense sessions and competitions. This approach tries to combine adaptations to fat oxidation with high quality on important workouts. The fuel for the work required concept is actively discussed by the group of Burke and other authors.
Another option is the so-called cyclical keto diet with carb days. It has been poorly studied scientifically, and for people who find it hard to control their appetite, carb days often turn into overeating. We advise treating it as an experiment, not a proven protocol.
For most people who simply want to eat healthily and train a few times a week, the optimal choice turns out to be a balanced diet with an emphasis on quality: enough protein, vegetables, fruit, whole grains and healthy fats. Extreme strategies are worth considering only when there is a specific goal.
- Strict keto:20-50 g of carbohydrates per day, adaptation required.
- Moderately low-carbohydrate diet:no ketosis, more flexible.
- Balanced diet:carbohydrates according to activity.
- Periodization:the amount of carbohydrates changes depending on the training day.
How to switch to a new diet without harm
If you have decided to try the keto diet, do not plan the switch for the week before important competitions or exams. The first 2-4 weeks are usually accompanied by reduced performance, so it is better to start in the off-season or during a period of light training. Increase your water and salt intake, and add foods rich in potassium and magnesium.
To assess the effect it is useful to keep simple records: morning weight, waist circumference, well-being, sleep quality, working weights or training pace. Without this it is easy to confuse water loss with weight loss, and temporary fatigue with intolerance.
If you are returning to carbohydrates after prolonged keto, do it gradually. Your weight will rise by a few kilograms due to glycogen and water - this is normal and does not mean gaining fat. The basis of the carbohydrate part should be foods with fiber, not sweet drinks.
Regardless of the chosen model, periodically monitor basic health indicators: lipid profile, fasting glucose, blood pressure. This especially applies to people who follow a diet high in saturated fat for a long time.
Editorial conclusions
The keto diet can be a convenient tool for appetite control for people with low physical activity, as well as an experiment for enthusiasts of long slow exertion. For intense sport and muscle gain, carbohydrates remain the proven choice.
Between the two poles lie many intermediate solutions, and for most people it is precisely these that turn out to be the most sustainable. The criterion of success is not the label of the diet but progress toward your goals and health.
If in doubt, start by assessing your own training, appetite and preferences - and only then choose a strategy.
We also recommend reading our articles on periodizing an athlete's nutrition, on choosing carbohydrates before and after a workout, and on how to assess progress during weight loss.
References
- Thomas DT, Erdman KA, Burke LM. American College of Sports Medicine Joint Position Statement. Nutrition and Athletic Performance. Med Sci Sports Exerc. 2016;48(3):543–568.
- Burke LM, Ross ML, Garvican-Lewis LA, et al. Low carbohydrate, high fat diet impairs exercise economy and negates the performance benefit from intensified training in elite race walkers. J Physiol. 2017;595(9):2785–2807.
- Gardner CD, Trepanowski JF, Del Gobbo LC, et al. Effect of low-fat vs low-carbohydrate diet on 12-month weight loss in overweight adults: the DIETFITS randomized clinical trial. JAMA. 2018;319(7):667–679.
- Hall KD, Guo J. Obesity energetics: body weight regulation and the effects of diet composition. Gastroenterology. 2017;152(7):1718–1727.
- Burke LM, Hawley JA, Wong SH, Jeukendrup AE. Carbohydrates for training and competition. J Sports Sci. 2011;29(Suppl 1):S17–S27.
- Kerksick CM, Wilborn CD, Roberts MD, et al. ISSN exercise & sports nutrition review update: research & recommendations. J Int Soc Sports Nutr. 2018;15(1):38.
Andriy Melnyk
A strength-sports coach and author of programs for beginner and intermediate levels. Writes about training planning.
