I think a lot seems to be down to metabolism and genetics.
I’m a size 10 and have been since around age 17/18. I’m now late 40s and had 1 pregnancy / child. No one in my family (parents, siblings, aunts, uncles, grandparents) has ever been overweight nor been on a diet.
I actually don’t own any scales. I have no clue what my weight is. But I know if I’ve put on weight if my clothes feel tighter. Most of my clothes are ones I’ve had for 5-15 years anyway, and I always buy the same size for new clothes.
I love my food and usually eat generous sized portions (or if being polite I’ll have a small portion first and then go for seconds/ finish off all the leftovers afterwards!) However, when I’m at home, most meals are cooked from scratch, and being vegetarian I also eat lots of veg and usually make healthy choices for food, such as whole grain carbs, fresh ingredients instead of processed foods, don’t really buy sweets or biscuits to have at home.
But, I will never hesitate to take treats when offered if out - such as biscuits offered at a friend’s house or at a work function where biscuits or cake is provided. Also if eating out I usually get a dessert as it’s part of the ‘treat’ experience of eating out. But I consider these things very much as occasional ‘treats’ and not part of my usual daily consumption.
I don’t really drink alcohol- maybe a couple of glasses of wine a month when out for a meal, but I never drink at home- only if out for a social event.
I never really did much in the way of routine exercise. I’m just not a sporty person. But, and this is a BIG ‘but’.... I’m usually on the go ALL THE TIME. DS has recently been diagnosed with ADHD, and on reflection I think I’ve also probably had this my whole life to some degree. I’m always moving, always active - always late, which means always rushing about and running for buses and appointments that I’m about to miss! I always try to fit too much into my day and don’t allow enough time to do everything, and am a bit disorganized, so I always end up crazy busy running up and downstairs, running for that bus that I’m late for and realizing I’ve forgotten my bus pass and have to run back home again to get it in time to not miss the next bus!!!! The amount of energy I must get through every day just with my normal level of life activity must be equivalent to other pps regular running and swimming sporting activities!