“Skipping meals slows your metabolism.”
Moderate confidence against the automatic slowdown rule. Direct breakfast-fasting evidence is small and short, and total activity can change even when resting metabolism does not. Meal-frequency reviews mostly measure weight and have weak certainty.
Skipping a meal does not automatically slow your resting metabolism. A small six-week trial found no resting-metabolic-rate change from skipping breakfast. But that does not mean long periods of under-eating are harmless, or that total daily energy use is always unchanged.
Resting metabolism, movement and the energy used to digest food are different parts of total daily energy use.
Safety note: Meal skipping can be unsafe with some diabetes medicines or if it leads to inadequate nutrition. It may worsen restrictive eating patterns.
Talk to a healthcare professional if: Get advice before regular fasting if pregnant, under 18, taking insulin or managing an eating disorder.
Skipping a meal does not automatically slow your metabolism. Meal timing should fit your hunger, schedule and total intake.
Choose a meal pattern that supports adequate nutrition, energy and manageable hunger.
Similar claims on Calorie restriction & metabolism impact
Don't fear that eating sensibly less will ruin your metabolism - it won't. Moderate restriction paired with strength training and enough protein is the healthy version; extreme, prolonged restriction is not the goal.