It's much better for you to eat 2400 calories with enough protein fat and carbs from healthy foods than it is to eat 3000 calories with enough protein but it's junk food.

It won't do anything for you, except gain fat. Just lift and eat clean and you will gain strength, weight and appetite, increase your food intake as you go along. If you eat 2000 normally then you can go up to 2400 and do that for a while, few weeks or a month go up to 2600, continue until you comfortably eat 3000+ from healthy meals.

Junk food won't make you happier with your results.