I dont know your height but youre supposed to eat a certain amount of calroies to maintain your weight and less than that to lose weight. It helps to exercise because you're burning caloried then too. Look into calorie intake for men your height and age and you can probably find the answers you need

You'll lose more

Not from just eating alone... you need to burn more calories than you put in - so you want to decrease the calories and increase your activity levels.

I eat so little that I have an eating disorder... but you can't tell by looking at me because my activity isn't high enough for me to look anorexic, though I am anaemic according to my doctor.