You can have lunch later. If you want to take a nap, I suggest you don't eat lunch, just eat an apple, because it is the easiest to gain weight after eating, and you can sleep peacefully after eating an apple. You can also eat it with dinner when you sleep. Eat something light, such as boiled vegetables, and put salt and other seasonings when eating. Never put oil, especially lard, and never eat it!
Take a walk after dinner 15 minutes. If you don't want to become an elephant leg, you'd better not sit down immediately after eating.
Do sit-ups before going to bed (I do 60, three times), then you may be hungry, so eat an apple. Because apple is an acidic food, it can promote gastrointestinal peristalsis and help digestion, so apple is the best diet food.