Children with obesity who follow a ketogenic diet for four months have lower morning cortisol levels, which is linked to reduced activity in the stress hormone system and improved metabolic markers...
Mechanism
Synthesis from 1 study
Eating very few carbs for four months turns the body into fat-burning mode, which shrinks belly fat and calms down body-wide inflammation. This tells the brain’s stress system to slow down, so the adrenal glands release less cortisol in the morning.
Most probable mechanism
When a child eats very few carbs for four months, the body starts burning fat for fuel, which reduces belly fat and inflammation. Less belly fat means less cortisol is made locally, and less inflammation means the stress system in the brain stops overworking. As a result, the adrenal glands release less cortisol in the morning.
Carbohydrate intake is restricted to below 40 grams per day, shifting metabolism to fatty acid oxidation and ketone body production
Ketone bodies, particularly β-hydroxybutyrate, accumulate in circulation and inhibit the NLRP3 inflammasome, reducing systemic inflammation
Reduced systemic inflammation and improved insulin sensitivity decrease chronic stimulation of the hypothalamic-pituitary-adrenal axis
Visceral adipose tissue mass decreases, reducing local cortisol regeneration by 11β-hydroxysteroid dehydrogenase type 1
Lowered HPA axis tone results in decreased cortisol secretion from the adrenal cortex, leading to reduced morning serum cortisol levels
Less supported by current evidence, but not ruled out
Lower insulin levels from reduced carbohydrate intake reduce fat cell stress and signaling that normally keeps the stress hormone system active, leading to less cortisol production.
Carbohydrate restriction reduces postprandial glucose spikes and lowers insulin secretion
Lower insulin decreases adipose tissue lipolysis and reduces release of pro-inflammatory cytokines from fat cells
Reduced adipose tissue inflammation removes a key driver of HPA axis overactivation
HPA axis activity declines, resulting in lower cortisol output from the adrenal glands
Fat cells release more adiponectin when the body is in ketosis, and this hormone directly signals the brain to reduce stress hormone production.
Ketone bodies activate the GPR109A receptor on adipocytes, increasing adiponectin synthesis
Elevated adiponectin levels suppress hypothalamic CRH release and pituitary ACTH secretion via central and peripheral signaling pathways
Reduced ACTH stimulation of the adrenal cortex lowers cortisol production
Evidence from Studies
Supporting (1)
Community contributions welcome
Low-Carbohydrate (Ketogenic) Diet in Children with Obesity: Part 2—Hormonal Effects of the Ketogenic Diet
Contradicting (0)
Community contributions welcome
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.