I am half French, my Mum is French and moved back there when I was 18. I spent all of my childhood and teenage year holidays there and in Switzerland visiting family.
I would echo what others have said, the French women in my family all ate everything, including bread, cheese, full fat yoghurt, real butter, but it was in moderation through eating 3 proper meals a day and just small amounts. Cheese would last ages as everyone only had a small amount after a meal. We would always have lovely salads and fresh fruit available and often fruit and yoghurt would be dessert. Nice cakes and sweet treats were just once a week maybe.
I do find the emphasis on meals difficult to get used to when I visit, for example when I stay with my mum, we can't really go anywhere in the morning as from about 11am she is in full swing preparing lunch, apéro is at 12, 12.30 she and her husband sit down for lunch and then after that is coffee and a sieste. There is then a small window to do something, before she starts thinking about the evening meal and the whole thing starts again!
In addition, they are pretty ruthless about weight and looks. As a teen, I was average sized, not fat in the slightest but not skinny- I was fit and athletic as I rode my ponies, cycled to the stables every day and ran for the school competitively, so very active and healthy. Every single year I would arrive to my Grandmother telling my Mum I had out on weight and must eat a lot of cakes! My Mum is tiny, I take after my British Dad and am taller and broader. It really affected me.
Now, I'm 43 and carrying a few extra pounds. I am healthy, happy and active and am in the process of losing weight in a healthy balanced way though exercise and healthy eating. I have never been hugely into grooming and image although I do wear make up, paint my nails, etc but it's not my main focus. my Mum although never directly saying anything, is very focussed on appearance as a measure of someone's worth and constantly talks of how great my cousin and step sister look as they are sooo slim and take care over their beauty treatments. She makes barbed comments, about my bust size, my shoe size, buys me clothes in sizes too large. I've never felt good enough because I'm not French enough!! I love the outdoors, spend my time walking my dogs, caring for my horse, am a SEND school teacher and love my job, but because I don't care about my looks enough, I am "bizarre" in her words.
Visiting next week for the first time in 3 years for that very reason and I am absolutely dreading it.
The chic French look is not all that, when it comes with such a mean self obsessed nature.