For starters, don't buy prepared meals.
For seconders, for SOME of your main meals, use legumes with rice instead of meat. this is just as good.
You need to find recipes, since legumes can be very bland.
And you will have more flatulence for a while until your body adjusts.
But legumes are high in fiber and very very good for you.
Legume meals such as:
Black bean stew and a whole wheat roll
Red beans and rice
Curried chickpeas and rice.
Lentil stew with rice
Pinto bean stew and cornbread
Peanut butter (or any nut butter) on whole wheat bread.
And don't forget eggs. Very economical and a good source of protein. Cheese omelet with whole wheat toast.
Also, when you use meat, make a stir-fry of 2-4 vegetables and add a BIT of meat.
We only need 50g of protein a day, and most Western diets get about twice what we need.
For my stir fries, I always use fresh garlic, sesame oil, soy sauce, fresh-ground black pepper.
Optional veggies are: cauliflower, broccoli, Sui choy, Bok choy, bean sprouts, carrots, sweet bell peppers (red or green), mushrooms, onion, carrot, snow peas, zucchini squash.
Meats that go well with stir fries are: chicken, beef, pork, shrimp