Drinking water on an empty stomach helps your body burn more fat because there’s no sugar or insulin blocking the process.
Evidence from Studies
Supporting (4)
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Metabolic impact of feeding prior to a 60-min bout of moderate-intensity exercise in females in a fasted state
This study found that when people fast overnight and then drink a sugary drink before exercising, they burn less fat than if they drink water instead. So yes, staying in a low-sugar, fasted state helps burn more fat.
Pre-Exercise Carbohydrate or Protein Ingestion Influences Substrate Oxidation but Not Performance or Hunger Compared with Cycling in the Fasted State
When people exercise on an empty stomach after drinking only water, their bodies burn more fat than when they eat carbs first — and this study shows that’s true.
Effects of aerobic exercise performed in fasted v. fed state on fat and carbohydrate metabolism in adults: a systematic review and meta-analysis
This study found that exercising on an empty stomach burns more fat than exercising after eating, because insulin stays low when you haven’t eaten — which is exactly what the claim says, even though it didn’t check water intake.
This study says drinking water helps burn more fat when your body hasn’t just eaten carbs and your insulin is low—which is exactly what the claim says.
Contradicting (1)
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Effects of time‐restricted feeding and meal timing on an 8‐week fat oxidation exercise training program—A randomized controlled trial
This study found that exercising on an empty stomach didn’t burn more fat than exercising after eating carbs — so the claim that being fasted and hydrated burns more fat isn’t supported.