Some people say dont eat after 8 and some say after 10
At the end of the day it depends on what time you go to bed on average.
If for example you go to bed at 11pm on average then you shouldnt eat anything after 9pm, always take away 2 hours before you go to bed and thats the time you should eat after!
It's what you eat and how much that make the real difference - i tihnk where the time of day thing comes in is for people who tend to snack in the evening - it can help to just not eat anything after a certain time.
One other problem with eating late at night is that depending on what you eat it can disturb your sleep patterns...sugary things with lots of caffeine keep you up, and if you eat too much too late, your digestive process interupts your sleep process...so that's something to keep in mind as well.
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I think it's mostly about eating less becuase you have less hours in the day to eat!