This is quite an interesting thread as there seems to be a clear division between those who say 'Luck, genetics, I eat what I like and remain slim'.
And those who are actively choosing a way of life that keeps them slim, talking of 'limiting', avoiding certain foods, mindful that if they eat a certain way they will gain weight.
I'd be very interested in people's height, weight and age and what their 'natural' diet would be.
I make no concerted effort to remain slim but, I'm tall, I don't eat much fruit (a bit of soft fruit in Summer, some stone fruits when they're in season the odd Autumn pear. I'll eat mango and melon about twice a year when the variety I enjoy are.in season, citrus I eat year-round in other things), generally unless they're at their peak, I don't bother with fruit.
I eat very seasonally, lots of vegetables but whatever is best at any given time, the same with meat, I don't eat ready meals, I eat processed food but only high quality, so charcuterie, cooked meats, sausages, pate, pork pies, bacon, condiments, an occasional cake or biscuit.
I eat a really varied diet, hugely, I really enjoy food and look forward to seasonal treats like gull's eggs, black truffle, grouse, asparagus, elderflower, oysters, morels, pheasant, sea trout, I could go on! I love food, I love cooking.
I don't eat when I'm not hungry though, I used to wake up absolutely ravenous up until my late 30s, so breakfast would be immediate and substantial. I'm not super-hungry in the morning any more so I tend to skip breakfast, may have brunch and then a late lunch or an early lunch followed by a snack about four.
I'm the cook in the house so we eat whatever I fancy but I do have 'rules', roasts are only eaten between 'back to school' and Easter, the final roast of the year is always an Easter leg of lamb, mince pies are only permissible in December, ditto hot cross buns can only be eaten on Good Friday, asparagus can only be eaten in the UK season, McDonalds are delish, but only on a road-trip, Vacherin is always eaten on Christmas eve and at no other time, blackberries can only be eaten if you've picked them, oysters when there's an R in the month etc etc.
I love food, there are so many delicious things to eat and I don't limit myself, but I'm very mindful about what I eat because I can only eat so much and I want it to be worthwhile every time I eat. I never eat for the sake of it, or from boredom.
It's a fascinating thing, food, and our feelings around it.