I don't know what restaurants you plan on dining in. Most TS restaurants will accommodate you. We eat healthy and it may take a little more work at first it becomes second nature. In order to bring you blood pressure down the first thing to avoid is SODIUM (salt). What to avoid popcorn, fries, hot dogs, condiments such as pickles, turkey legs, chips well you get the idea.
The key is to fill your body with high water content natural foods, fiber/grains and lean protein. Breakfast egg white omlet (or egg beaters)with tomatoes, mushrooms, spinach, dry wheat or rye toast, and share a fruit plate. Use pepper ...no salt. Oatmeal is a geat option...pair this with a fruit plate and you have vitimans and fiber (which lowers BP and Cholesterol) or a Fiber cereal and skim milk, fruit, fat free yogurt. I have had all of these in any WDW restaurant. Just because it is not on the menu does not mean it cannot be done...they are always happy to accommodate.
Lunch..you can get a salad with grilled chicken, turkey, shrimp or fish most anywhere. Order the salad without cheese, sour cream, croutons (croutons are bread fried in fat...they look like little harmless cubes but are not) Get low fat dressing if they have or regular dressing on the side. Dip your fork into the dressing first then into the salad. You will get all the flavor of the dressing without all the fat and calories. You can also get a sandwich or a wrap...turkey or chicken...load up with veggies, use mustard no mayo. There is a place in liverty square that sells all kinds of fruit and I think they also have baked potato chips. You can also but an apple or banana or a fruit cup and have it as a snack. I have also found dole whips to be a great snack too. Do not get a twist of vanilla, just the plain pineapple (dairy free) and get a small and to make it feel like more get the pineapple spear with it.
Dinner can be tricky but not impossible, keep away from the places that serve family style or BBQ. Avoid anything that says fried, sauteed, crispy, smothered, creamed..
Start with an appetizer shrimp cocktail is great (also contrary to former belief...not high in cholesterol) try to avoid soups if you can they are very high in salt. Opt for another salad with dressing on the side. For your entree, look for grilled, steamed or broiled and ask for the food to be prepared with as littel fat as possible. If the entree comes with sauce, get it on the side so you can dip your fork into it. BEWARE the mashed potatoes....LOADED with butter. Ask for a plain baked potato (if it's large have half ) and do not put butter on it but put pepper or smear a little sour cream on it...not a blob. Try to eat fish, turkey (not legs), or chicken. Any good TS restaurant will accommodate your requests. Aslo I ahve found the CG and Citricos has items that are perfect as is..One of the best dishes at the CG is the halibut steamed in a banana leaf (excellent). Pasta is ok, but you have to watch the sauce...Marinara or pomodoro is best...BEWARE the bolonese, a la vodka, alfredo...all are filled with cream, fat and salt. Do not order any baked pasta, such as lasagna, again loaded with fat, salt and meat. Have a large salad with veggies and pasta with marinara. If you want a meatball, get it on the side and share. The bread basket is wasted calories...just turn it away. Instead have a glass of red wine (very good for the heart) and great conversation while looking over the menu...bread is not needed.
Dessert does not have to be a no-no. Sorbet is a great choice or if you want to splurge (once a day is good

share a dessert. Also watch your cappucino...ask for fat free milk.
If you drink sugared soft drinks...stop!
Alternatives are water, and light lemonade and sugar free Iced tea. Drink lots of water. It fills you and keeps you hydratred and flushes the salt out of your system.Bottled Pelligrino water with lemon and lime is great with dinner, it helps you digest.
Just think of this: Avoid porcessed foods which contain salt (lots of it) Drink water or non sugared soft drinks. Think fiber, whole grains (which grab on to cholesterol and remove it from your body) High water content foods: fruits and veggies and lean protein...try to avoid red meat of all kinds and keep it as a treat. I do not cook red meat of any kind at home, but when we want it we go out for a steak dinner..maybe every 6 weeks or so.
Well it's a start...it's very painless. You will feel better almost instantly. Don't worry about portions just yet, but this is what your plate should look like. Half the plate should be veggies, one quarter lean protein and the other quarter, good carbs... the unprocessed kind.