In my view, having read a fair number of peer-reviewed medical papers on exercise, nutrition and the gut out of nerdish curiosity, there are helpful foods in terms of managing appetite, which are things like vegetable soup, porridge, greenish bananas and low fat natural yoghurt. They seem to switch it off. Eating a green salad with a drizzle of nice olive oil dressing before every main meal can be helpful too, as can drinking a big glass of cold water. There is a lot of interesting science behind some of this if you dig.
Then there are unhelpful foods, which is basically anything with added sugar in, and some naturally sweet things or carbohydrate-laden things. So bread, potatoes, cake, biscuits, sweets and puddings, and possibly having too much honey. (We all know this, of course).
Fruit sort of straddles those groups as sometimes it is fine, and sometimes you get the munchies even if an hour before you were full of the stuff, e.g. gorging on strawberries, grapes, very ripe bananas and so on. Carrots and parsnips also are rather full of natural sugar and need a bit of caution here and there.
Then there are high calorie foods that are exceptionally useful in helping moderate cholesterol and appetite, and the main one of these is nuts. So a handful of plain cashew nuts on that natural yoghurt and banana breakfast you might have is generally a good thing, and won't impact on appetite. (Eating a bag of roasted and salted peanuts at the pub is not a good plan, however).
So ultimately if you want to control things, phase out the unhelpful, phase in more of the helpful and keep an eye on the fruit and sweet veg group.
Then there is exercise. Killing yourself at the gym is going to turn on the appetite for some people, and damage weight loss. However a lower level of exercise stimulates the metabolism, lowers blood sugar and can turn off appetite. A good example of this is training yourself to walk for a total of 3-4 miles a day, in other words 45-60 minutes. That is not going to wreck anything in appetite control terms.
This is of course all brilliant advice except we are surrounded by situations and people who make regular adherence very hard. However every time someone do one of the helpful things instead of the unhelpful things, it is a small victory. It does not have to be all or nothing. We also have to move beyond notions of 'satiety' in the WW and SW sense as I think they just encourage people to eat too much bacon, potatoes, etc. which does not help retrain the appetite in the long term.
(Happy for any medics to comment on the above advice, btw, just in case I have misunderstood anything, but I think it's all sound).