Bad weight-loss advice #2: Don’t eat after 7 p.m.
Why it doesn’t work: Assuming you're eating reasonable quantities of healthy foods throughout the day, there's no reason you can't have an evening snack, even if it's something sugary or salty. There's no evidence that ingesting calories later in the day makes you gain weight. Plus, if you're among those who go to the gym right after work, when else are you supposed to eat?

i always thought that the reason you dont eat in the evenings is because

a: you metabolism slows down when you sleep, there fore your body will turn more of the food into fat rather than energy,
b: when you sleep you arnt burning fat (or very very little) so the food has to go somewhere
c: if you eat later your body has to be active to digest the food, which i believe can cause lack of sleep

i dont know how true any of this is but it seems logical. the version i have heard is dont eat 2 hours before you go to bed, i think 7pm was only every supposed to be a guideline. i could be totally wrong of course