Hi, S.!
I have Fibromyalgia, too, and a husband who is hooked on junk food. The deck is stacked against you because you both have developed a taste for highly salted, fried foods and those overloaded with sweeteners. I find that fried foods, heavily salted foods, those with artificial sweeteners (Neutrisweet, Aspertaime, etc) and those with artificial colors and, added fillers, do the most damage guarenteed to trigger a Fibro attack or induce Fibro Fog. I wish you had the opportunity to just be a teen, but the fact that you want to help your mother out by preparing nutritious meals is really great! Start by making small substitutions. Eat more fresh salads, and put the dressing in a dish on the side instead of pouring it on the salad. Dip your fork into the dressing, then into the salad. You'll still get the taste of the dressing but not all the fats and calories.
I get more vegetables into my diet by eating more salads, making soups from scratch using left overs, and recycling things into an omlette or a casserole. I also drink V-8 Juice. When buying fresh vegetables, look for bright color and firm texture. Eat plenty of beans, especially 1/2 cup of black beans 2-3 times a week. (I wash the beans, add some chopped onion, grated cheese, then nuke it.) Eat lots of fresh fruits, especially bananas. Bananas, oranges, and potatoes (baked) will help replace the magnesium in your Mom's body.
I love fried chicken, but usually skin it (cuts down on fat) and bake it covered with herbs and spices. If you feel intimidated about this, just sprinkle on some Mrs. Dash (found with the spices on the grocery shelf).
If I make a sandwich, I use whole wheat or rye bread, not white bread.
I make sure to consume some protein at EVERY meal: peanut butter; cheese squares; nuts, etc. A really great way to increase the protein in your diet is to take any creamed soup like cream of mushroom, add the milk to it, then add a tablespoon or two of peanut butter and heat. It's power packed and tasts good! My kids liked peanut butter pizzas, too: peanut butter on bread with a cheese slice on top toasted in the oven until the cheese melts.
Buy nuts and sunflower seeds to your diet. They can be a snack or can be added to the salads, etc. So can small pieces of dried fruits.
When cooking, use sea salt instead of something like Morton's Salt. You can buy the one with the grinder built in to the top of the container. It has more flavor but adds less salt to your diet. Cook with herbs and spices for flavors.
Become a label reader. Try to minimize sweeteners in things. Lots of foods contain sugar, brown sugar, molasses, fructose, etc. Adding sugar is one thing, but WHY do you need to add 5 kinds of sweetener to the same thing?
If you slip up and eat a donut, don't beat yourself up, but just resolve to make a better choice next time. Eventually, as you gradually add better food choices into your diet, when you slip up and eat something loaded with oils, sugars, or salts, your body will tell you to shape up because you'll feel bloated, sluggish, slightly sick, etc.
Remember, it's important for both of you to drink lots of water BETWEEN meals.
Eat fish (tuna fish is o.K.) at least twice a week.
Watch out with crackers. If you can get to a health foods store, buy rice crackers. They are better with less sugars.
Take a multiple vitamin. (There are other suppliments which would help your Mom, too.)
Avoid eating ONLY highly processed meats like hot dogs, ham, balogna, etc...those high in nitrates. It's better to have lean meats in servings about the size of a deck of cards: baked chicken breast, pork chop, hamburger, etc.
With this change in diet, your Mom nees to add some simple stretching exercises. You can do them with her, too, and can learn how to massage the trigger points which become so painful for her.
This is just a beginning of easy changes you can impliment. Try to have a handful of baked chips unstead of fried ones; eat air-popped pop corn instead of some loaded with butter and lots of salt.
Instead of lots of pop, buy Seltzer and add it to plain fruit juices. Learn to drink tea, herbal teas, and coffee black instead of those loaded with sugar and cream.
You must have some oils/fats in your diet, but cut out the saturated fats. Cook using olive oil, or put some olive oil and some butter (NOT MARGARINE) in the pan before you saute the meat, veggie, or egg.
I know this is a lot to absorb, but it's a start. Try to get all the food groups into diet at least once a day.
You and your mom remain in my thoughts and prayers.
K. R.