Symptoms during initiation of a ketogenic diet: a scoping review of occurrence rates, mechanisms and relief strategies.
Level 5 - mechanism / opinion, no new human data
Scoping review synthesizing heterogeneous observational, mechanistic, and clinical literature without meta-analysis of randomized trials.
PubMed 40206956 · doi:10.3389/fnut.2025.1538266
What was done
Authors conducted a scoping review across Embase, Medline, and Web of Science databases, alongside citation searching, to identify literature regarding symptom occurrence rates, underlying mechanisms, and symptom-relief strategies during the initiation phase (keto-induction) of a ketogenic diet.
What was found
The abstract reports no numerical rates or effect sizes. The literature is described as highly heterogeneous. Frequently described transient symptoms include "keto-flu," nausea, emesis, reduced appetite, hypoglycemia, acidosis, increased risk of kidney stones, altered liver biochemistry, and skin rash. Most proposed mechanisms rely on general physiological theory rather than empirical testing. Reported relief strategies include avoiding initial fasting protocols and supplementing with medium-chain triglycerides (MCT) or ketone salts. While electrolyte and ketone ester supplementation possess a physiological rationale, clinical studies testing their efficacy are lacking.
Why it matters
Adverse symptoms during keto-induction frequently lead to dietary non-adherence. This review maps the reported side effects and shows that popular mitigation approaches largely lack clinical trial validation.
Limits
The abstract does not disclose the number of included studies, total participant count, or numerical symptom incidence rates. Included evidence is highly heterogeneous, and few studies directly evaluate the mechanisms or interventions for symptom relief.
Cited by
- context Fatigue and muscle weakness experienced during ketogenic diets or fasting are primarily driven by sodium deficiency.