I will give you an example of an average day’s meals so you can get some perspective.(Keep in mind that this is a workout associated meal plan)]
Breakfast : either two eggs with a banana or an oatmeal that contains : almonds and walnuts (crushed as powder), a spoon of honey , a spoon of peanut-butter, a banana (sliced and “smoothed” with a spoon) and a little water (you can use milk, but I don’t drink it myself). Optionally you can add a little bit of cocoa for flavor.
snack : If i am able , I will eat a fruit, like an apple or an orange or a toast with cheese and a smoked turkey slice if i am hungry.
Lunch : For lunch think 3 basic ideas. You need protein , carbs and some vegetables. As a basic guide line , for protein I eat meat (probably chicken or fish) or beans. For carbs either rice,potatoes,sweet potatoes,maybe pasta but i tend to avoid bread. For vegetables you can try different variations each day , so you can cover many vitamins and nutrients with your diet. (for fats , they are either covered with the meat or the nuts and almonds)
Snack 2 : This is optional for me , but some days (leg days for example) I am really hungry from either working out or work. Maybe an egg or a toast or a fruit as a lighter choice.
Dinner : At dinner most of the times i eat either the same with this day’s lunch or something lighter like a salad with some tuna. If i don’t feel like eating too much i will finish the day with some yogurt with honey and walnuts mixed (it’s delicious)
Also , about coffee I try to minimize how much i drink of it because i don’t like the dependency. So I will have one a day at most if I need to study.
I have a cheat day at Saturday , when i eat whatever i want. I don’t eat sweets as a daily habit , or almost any for that matter.