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Skipping meals - does it really slow your metabolism?

Skipping meals - does it really slow your metabolism?

Skipping a meal does not crash your metabolism. The honest slowdown from real weight loss is small, about 65 to 230 kcal a day, and it only shows up after weeks of big cuts, not a missed lunch.

12 Jul 2026 · Burnie Academy
metabolism myths fasting weight-loss

If you skip a meal, your body goes into 'starvation mode' and your metabolism crashes.

mostly false

Mostly false. Skipping one meal just means you eat fewer calories that day. Your body burns stored fuel (glycogen and fat) to fill the gap. A real metabolism slowdown is small, and it needs weeks of big daily cuts, not a missed lunch. Even a full month of daily 18-hour fasting only dropped resting burn by about 112 kcal a day, roughly 6 percent.

Sources: Nunes et al. 2022 - Adaptive thermogenesis (PubMed 34839398) · Ağagündüz et al. 2021 - Effect of Intermittent Fasting (18/6) on Energy Expenditure (PMC8710159)
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