It depends on far too many things.
How much do you excersize? Are you feeling more tired or energetic the days you don't want to eat more and the day after?
Have you tried eating with calorie cycles? You count the whole week's calories and spread them unevenly through the week to keep your metabolism shocked.
So lets say you eat 1000, 1800, 1500, 2200 etc and the total of the week ends up being the same as eating the same calories everyday. This helps a lot with people who's apetite has peaks and lows and who have once a week a day/night where food is part of celebrations etc.
If you are very active you should force yourself to at least drink a hydrating drink with carbohydrates and electrolytes after the heaviest part of excersizing. They have about 250 calories or 120 calories depending on the brand and will make sure you don't burn your hard earned muscle or faint.
If eating less one day makes you feel heavier and lazier the next you should force yourself to eat a bit more. Food is medicine, if you need it you should take it. During diets we can often fall to the other extreme of undereating which is just as (if not worse) dangerous as eating a bit too much.
If you start seeing food as medicine and fuel, you'll be responsible eating.
Hope this helps.