@swampytiggaa exactly! I'd love if just being veggie made me slim!
I remember when I was slim and my then fiancé and I were in a taxi and the driver complimented my figure and said something like "you must hardly eat!"
Fiancé responded "nah! She eats more than me! (He was a big lad insofar as very tall and muscular as he played rugby) But she's vegetarian"
It was the 80's so vegetarianism still was fairly uncommon
Taxi driver said
"Nah my sister in law is vegetarian and she's huge"
I think it was especially noticeable that I was tiny then when I was out with fiancé as he was a big (6'4") well built lad and I'm 5'2" and at that time was a size 6. So we must have looked quite odd as a pair! I also walked places with him quite fast most of the time then just to keep up! 
@SunshineCake I get the "struggling not to eat feelings"
Not sure what to suggest there - but I empathise
@Millie2008 hmm I think we'll have to agree to disagree on much of that
Grazing - everyone's different. Grazing isn't necessarily the factor rather than grazing will of course lead to greater consumption of calories quite naturally
Fasting and slowing of metabolism - scientifically/medically the jury is still out on this one. The studies that show it works tend to have been funded/instigated by people with a vested interest in it working, there are few long term studies for a variety of reasons, ditto more loss around stomach. I don't believe there has as yet been a way of spot reducing weight identified as successful
Losing weight slowly - I believe long term has been found to lead to greater success with maintaining weight loss
Sugar v fat - again hmm, if we're talking pure refined sugar yea it's nutritionally empty, if you're talking sugars broadly as in carbs - it's not that simple. All food groups are needed nutritionally and complement each other. That's why imo it's not sensible to cut out a whole food group. You're cutting out nutrients if you do so and also cutting out nutrients that enable the absorption and healthy metabolism of the nutrients in other food groups.
Eg as a vegetarian I have to be careful I'm getting enough iron, protein and b vitamins
But there's also the fact that iron rich foods should be consumed at the same time as vitamin c rich foods for the iron to be absorbed properly
There are fats and carb rich foods which are essential to health and also increase absorption and metabolism of other vitamins etc
Low fat was the big thing in the 90's and noughties, then it was noticed that certain ailments were increasing/occurring due to malnourishment aspects
I was training as a nurse when the first "butter is evil" thing was happening and everyone was switching to sunflower oil spreads, I was on a community nursing placement and observing dietitian consultations as part of this.
The dietitian surprised me by advising a diabetic to stick to real butter rather than switch to sunflower oil spread which at the time was believed to be much healthier.
I asked her why after the patient left.
She said in her experience this was another fad, that the healthiest diet is based on the majority of the food we eat being in as close to its natural form as possible, that it was food processing was the main issue. "Fighting nature"
Right enough a few months later there started to filter through news about trans fats, oil based spreads not being as healthy as first thought etc
And over the years I've noticed this happen a lot with what's deemed a healthy food and what isn't etc - eg eggs being demonised for a short time due to supposedly being high cholesterol, whereas now we know it's the healthier type of cholesterol and not the more dangerous one.
It's really hard to wade through all the research and make sense of it all
Eg the intermittent fasting is possibly us returning to a more natural (evolutionarily speaking) way of eating as 3 meals a day is a relatively recent development - as is the huge amount of meat some people eat, that's really recent as in the past, even recent past meat was simply too expensive for most people to be able to do this.