eating after 7:00 PM

found why it is said not to eat after 7:00 PM in this artical:

Stop Eating 3 Hours Before Bedtime

You've probably seen the suggestion of not eating anything after 7 p.m. Well this generally assumes you go to bed around 9 or 10 at night.
If you are a night owl, you may retire a little later so it may seem unrealistic to not eat anything after 7 if you don't go to bed until 12 a.m.
Generally, the rule of the thumb is to not eat anything within 3 hours of your bedtime. So if you do usually go to sleep at 1 a.m. this would mean no food intake after 10 p.m.
The reason you don't want to eat late at night is because your food may not properly digest. This can cause morning gas and stomach cramps.
Some people who complain about bloating never realize that it's from the gas and food particles left over from improper digestion. This can be avoided if you cut down the late night snacking.
Eating late at night also forces your body to use its energy on digestion,. One of the primary functions of sleep is to help you recuperate from the day. You want your body to be as relaxed as possible so you can wake up energized.
Now we all know we have to cheat at some points. It's just not realistic to believe you can refrain from eating late at night every single night. So if you must cheat, then eat something healthy like a piece of fruit or a very small handful of nuts.

Lela Calkins