I've been vegan two years before starting hormone treatment. I'm 1.80 meters and I was 65-70kg. Didn't exercise. Drank lots of coca cola and ate vegan junk food.
Started HRT, stayed same weight but lost muscle and got a big belly.
Started running. Didn't help.
Changed to eating whole fruits (apples, grapes, dates, oranges, bananas), vegetables (mostly cucumbers, boiled sweet potatos, boiled potatoes), legumes (chickpeas and split peas) and grains (mostly whole rice) with no oil and only select processed foods (organic tomato paste, soy chocolate milk, almond milk). I also eat a bit of freshly ground flax seeds for omega 3. I start the day with the fresh fruit and eat them throughout the day and end up with a cooked dinner where I slice sweet potato and potato cubes and put them in a pot with brown rice, split peas, chickpeas and appropriate amount of water. I eat the cooked dish with the tomato paste on the side as a kind of low sodium ketchup. This gives me all the vitamins and minerals I need when eaten in the correct minimum amounts, and I did not limit my intake of raw fruits and vegetables, only the cooked and processed parts.
So basically this way, I ate as many calories as I wanted and ended up stabilizing at a weight of 60kg, which seems a pretty low BMI but it fixed my digestion which was shot to hell my entire life and eating so much fruit got me off the coca cola addiction and my belly came back down to its size pre-HRT. I like this method and how it works for me because I don't have to limit calories, I eat 2000-3000 a day, often more... and if I want to gain weight, I can just supplement some junk food every now and then. This is what worked for me and I have pretty much mastery of my total weight in this method. It's my own special form of what's called 80/10/10 raw till 4.
The idea is basically if you focus on eating whole foods designed by biological evolution and not by the industry, your body will know how to handle it better.
Anyway, I know there are lots of people who will say no it doesn't work, so much sugar blah blah blah... from my experience, as long as I keep my fat intake low and my carb sources from natural whole foods, my body will burn those carbs like nobody's business. Works for me.