Research
Mixed
The impact of a ketogenic diet on endurance performance is controversial and context-dependent, with some studies showing improvement and others showing impairment.
If you are an endurance athlete, switching to keto is risky for performance. Some people improve, but many see a drop in high-intensity performance. It requires a long adaptation period and may not be suitable for all types of endurance sports.
LimitedQualifiesLOW confidence
There is no clear consensus on whether a ketogenic diet provides benefits to, or hinders, endurance performance. Variation in intervention duration and intensity, modes of exercise, study design, and study populations likely contribute to the controversial findings.
Why this rating
Highly conflicting results across studies.
Source
A ketogenic diet for reducing obesity and maintaining capacity for physical activity
E. Angela Murphy et al. · Current Opinion in Clinical Nutrition & Metabolic Care · 2019
DOI 10.1097/mco.0000000000000572
narrative_reviewCited 14×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- A ketogenic diet promotes rapid fat mass loss in obese individuals, primarily through caloric restriction and appetite suppression rather than a unique metabolic advantage.Moderate
- A ketogenic diet maintains resistance exercise performance and does not impair strength gains, even if there is a slight loss in lean body mass.Moderate
Related findings · Mixed
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This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →