Answer
Mar 24, 2020 - 08:05 AM
Fat burners are often some kind of stimulant. Most of the time it's caffeine, but sometimes it can include other ingredients as well. Caffeine, of course, gives you energy and can passively help you burn a few more calories throughout the day. If you take fat burners too late in the evening – less than four or so hours before you plan to go to bed – you can expect an excess of energy that you'll have trouble working off. It's not like exercise, which can wear you out and make you sleep more easily. Since supplements are chemicals your body is processing, they linger in your system. Caffeine specifically tends to last in your system for 4-6 hours before it wears off.
