Hi:

All 16:8 means is that you eat what you are going to eat for that day in an 8 hour timeframe of your choice.

It depends on what your goal is.

If you want to gain weight, eat more than your TDEE during the 8 hour period.

If you want to maintain your current weight, eat at your TDEE during the 8 hour period

If you want to lose weight, eat less than your TDEE during the 8 hour period.

To do any of the above, you need to know your TDEE and count the calories you eat during the 8 hour period.

Eating only during an 8 hour period, by itself, does nothing to help or hinder weight loss. It is how much you eat during the period that counts (just the same as any period of time during any day).

Good Luck!

Hi again:

It is simply a matter of calorie counting. If you have a TDEE of 1800 and eat 3600 during your 8 hour eating windows, you will gain weight. If you eat 1200, you will lose weight. Here is how TDEE works: http://thefastdiet.co.uk/forums/topic/tdee-for-the-curious-or-why-dont-i-lose-weight-faster/

16:8 is simply a standard every day reduced calorie diet. The less you eat, the more you lose. You choose how much less to eat, which will dictate how fast you lose. The link above will allow you to estimate your weight loss given the number of calories you choose to eat.

Good Luck!