Why fasting before a walk burns more fat
Effects of aerobic exercise performed in fasted v. fed state on fat and carbohydrate metabolism in adults: a systematic review and meta-analysis
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
NEFA (fat in blood) didn’t increase during fasted exercise—even though more fat was being burned.
Common belief: burning more fat = more fat released into blood. But this study shows fat oxidation increased without a rise in circulating fat, pointing to internal muscle mechanisms.
Practical Takeaways
Do 30–60 minutes of moderate cardio (walking, cycling) before breakfast if you want to maximize fat burning during the session.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
NEFA (fat in blood) didn’t increase during fasted exercise—even though more fat was being burned.
Common belief: burning more fat = more fat released into blood. But this study shows fat oxidation increased without a rise in circulating fat, pointing to internal muscle mechanisms.
Practical Takeaways
Do 30–60 minutes of moderate cardio (walking, cycling) before breakfast if you want to maximize fat burning during the session.
Publication
Journal
British Journal of Nutrition
Year
2016
Authors
A. Vieira, R. Costa, R. C. Macedo, Leandro Coconcelli, L. F. Kruel
Related Content
Claims (6)
Hydration in a fasted, low-insulin state significantly enhances fat oxidation compared to hydrated states following carbohydrate intake.
Working out before eating breakfast burns about 3 grams more fat than working out after eating, because your body has to use stored fat for energy when you haven’t eaten.
If you eat before working out, your blood sugar and insulin levels spike more during exercise than if you work out on an empty stomach.
Whether you exercise before or after eating, the amount of fat floating in your blood doesn’t change much during the workout — so the extra fat burning when fasting must be happening inside the muscles, not from more fat being released.
Whether you're fit or out of shape, male or female, young or older, working out before breakfast still burns more fat than after eating — as long as you're not sprinting at max effort.