Research
Hormonal
Insulin acts as a rapid, minute-to-minute indicator of energy balance that tracks acute metabolic changes better than leptin, which reflects stable total fat mass.
Don't expect your body's fat-regulating hormones to react to every single meal instantly. Leptin changes slowly as you gain/lose fat. Insulin reacts quickly to meals but is designed to manage glucose, not just signal fullness. Focus on long-term trends, not daily hormonal spikes.
StrongSupportsVERY_HIGH confidence
Insulin secretion faithfully tracks changes of energy balance on the order of minutes to hours... The half-life of insulin in the blood (2–3 minutes) is consistent with its role as a minute-to-minute indicator of ongoing metabolism
Why this rating
Well-established physiological data cited throughout the review.
Source
Insulin and Leptin as Adiposity Signals
S.C. Benoit · Recent Progress in Hormone Research · 2004
DOI 10.1210/rp.59.1.267
narrative_reviewCited 264×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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