If chips, potatoes, fast-food, soda, cakes and sweets are part of your regular diet, try cutting them.
You'll be surprised at how much weight you can lose just from cutting out sodipop.
Yeah, you probably want to reduce sugar and carbs.
Tuna salad is quick and easy to make big batches of:
Tuna + Red Onion + Sour Pickles + Mayo (black pepper optional)
Or just make burgers with leaner beef.