I am obese. I used to be a lot more obese. I also had diabetes and chronic venous insufficiency. Plus a large black patch on my left leg that was getting bigger and blacker every year. Then I started developing heart valve issues. Then the diabetes med I was taking starting turning up in those 1-800-BAD-DRUG commercials that talked about heart valve issues. And I had every cardiac risk factor (except for smoking) on the checklist. Not a great place to be. I was turning into one of those guys you see on the
local news, who they have to cut the side out of his trailer to get him out when he has a heart attack.
What worked for me sounds pretty radical, but my problems were pretty radical too. Based on a couple of persuasive books, I eliminated a bunch of stuff from my diet:
1) animal products of all sorts -- chiefly because they are inseparable from their saturated fats
2) processed food of all sorts, including refined grains (white flour) and refined sugars (I still cheat a tiny bit with sugar)
3) added oils (plant oils in whole foods are OK within reason, gotta watch the avocados and the nuts)
Two years on that and my diabetes went completely away. It has subsequently stayed away, no more diabetes meds for me. The black patch on my leg is gone too. I lost more than 200 pounds, although about 50 of that has crept back as I got more comfortable with cooking and eating whole plant foods. My cardiologist says my heart valve issues stabilized as soon as I stopped taking the bad drug and eating healthy. All my lipids numbers are good now, though I still take a statin to keep my doctor sweet. I'm still way too heavy, but that's because I eat too much food no matter what I'm eating.
Eating this way, I'd answer your questions like so:
1) Whole wheat bread made without oil or sugar is fine. Eat lots. You can't really buy this. You have to make it yourself (flour, yeast,
water, salt) although there are a few commercial brands that have very small amounts of oil and sugar and are (IMO) "good enough". Toufoyan makes a very nice whole wheat pita bread that Walmart carries, too.
2) Potatoes are fine. Very healthy, very safe, don't even spike my blood sugar. However, potatoes cooked or served with any kind of *grease* (butter, sour cream, cheese, fry oil) are not so good. I eat mine with salt or mustard or hot sauce or soy sauce, typically.
3) Sugar I allow myself in very small amounts. I've given up on artificial sweeteners experimentally, and I don't think the *kind* of refined sugar matters very much. But I seem to tolerate a teaspoon here or there as a flavoring ingredient. I try not to buy anything that has sugar as an added ingredient (which pretty much excludes all processed foods, even the ones from health food stores). I sometimes eat a few pieces of candy, because bad willpower.
4) No dairy for me. Some of the plant foods advocates I read think dairy proteins are carcinogenic. I'm not convinced by the science on that, but it turns out to be irrelevant, because it's impossible to strip enough of the fats out of any dairy product to satisfy me. My target is less than 10% calories from fat in any food (except for a few oily whole plant foods, in moderation) and there isn't a dairy product out there in retail commerce that can meet that standard.
5) When eating in restaurants, the real question is what whole plant foods without added oils are available? And the answer, typically, is "none". The most consistently available item is a plain baked potato, which I then load up with salsa (if I can get it) or sugary catsup and barbecue sauce (if that's my best alternative). Sometimes I can find tasty
vegetarian dishes and will eat them, even though they are sauteed in oil (as they usually are).
All this is my thing, tailored to my problems, and visibly solving them; it might not be sensible for anybody else. I got my info from books, especially:
Prevent And Reverse Heart Disease -- Caldwell B. Esselstyn
The Starch Solution - John McDougall << -- this website also has a very friendly and helpful forum
There's also a pretty accessible movie, available various places, here is the free trailer:
Forks Over Knives - movie trailer
For what it's worth I am not a philosophical vegan, even though I currently eat a more restrictive diet than most vegans. I grew up eating lots of wild game meat and I think that a lot of the nutritional dangers of animal products in our modern diet are due to their agribusiness methods of raising. I would cheerfully eat wild game and good home-raised eggs, meat, and dairy, if I had them and could do so in moderation; but I haven't started hunting or raising any of that myself (yet) and am not in a hurry to start because I don't need extra calorie-dense foods in my pantry until I am slimmer. The
deer and
rabbits on our
land are safe from me for the time being. But if wild turkeys move into my forest as I improve its food crop densities, I reserve the right to change my mind!