Here's a quick rough estimate of a typical meal I have, which I'll have 3-4 times a day.
Full packet pasta: 660 calories
2 onions at about each: 80 calories
Half a tin of tomatoes: about 50 calories
Half a tin of sweetcorn (about 100g): 270 calories
5 large mushrooms: about 70 calories
Garlic puree: About 40 calories
Tomato Puree: About 60 Calories
Coriander: about 20 calories
300g of chicken breast: about 510 calories
Which puts the whole meal at around 1800 calories, and then I'll have some fruit juice, or a beloved lucozade with it, which pushes it to just over 2000.
So for you to be doing 7000 a day, you'd need to be doing eating that quantity of food over 3 times a day, and that portion doesn't look as big as it actually is as the plate is quite large.
With regards to 5UB though, if you can increase the amount you eat, while trying to make everything yourself as well as a good gym routine, there's no reason you won't start putting muscle on and filling out a bit, it can just be difficult sometimes to adjust to eating a lot more.