As others have said, many of the things are natural preferences that happen to keep you slim.
I actually enjoy a lot of "plain" foods, and additions that other people like would spoil them for me. For example I wouldn't put sugar or honey on porridge/cereal/fruit, I wouldn't add butter to boiled potatoes or veg, I don't like mayo/sauces/dressings .
This is really helpful since a salad of just lettuce, cucumber, tomatoes, peppers, chicken might have 200 calories whereas adding Caesar dressing, BBQ sauce and Parmesan shavings (as DH would) makes it about 600 calories but not much more filling.
On the other hand, I do love really indulgent desserts like sticky toffee pudding, chocolate brownies, cheesecake, ice cream... and have something like that most days.
Don't agree with the not snacking - I definitely eat more often than most people in my office, but things like veg crudites, fruit, natural yogurt, mini cheeses. I don't see things like crisps and chocolate as snacks since they don't really sate my appetite - I enjoy them as treats for the taste, but don't see them as a replacement for food.