Relationship with food and mom

Hi, I'm 17f almost 18 and my mom has a really bad relationship with food I feel like, i'm not sure if its normal or not so I wanted to ask advice about that. Its late at night so my post might not make alot of sense but I do not have the energy to read it all back and english isn't my first language.

My mom generally speaking is very strict when it comes to food me and my sisters eat but also on herself. She doesn't allow us to drink anything sweet only like once in a while when we go out for dinner but then its strictly only one glass and she is always complaining about me and my sisters being so unhealthy and its really bothering me. She herself always says "eating sugary or fatty foods makes me unhappy and sad" which like is to the point she says it daily and it sounds very unhealthy.

Me and my sisters are all basically adults yet she complains about us being fat. I have my own money i get from my dad weekly and i notice i always use that to force feed myself when she isnt home out of fear of missing out on food when she is home.

This is making me gain weight. I've nearly had an eating disorder before due to being bullied as a kid. I explained this to her but she still comments on me eating around her everytime. I need to hear her talk to me daily about having to eat less even though around her I barely even ever fucking eat??? I feel like she wants me to starve like she does to herself.

She once got mad at me for bringing back home some left over chips from the cinema for eating unhealthy in the cinema. Once she had to leave a week for her job and searched our TRASH bag we left at the door to throw away to see what we ate that week. On birthdays or something she doesn't really allow us to eat anything extra either. She also comments on the food habits of others on the streets or collegues its so annoying

I can't find the right words or moments to describe the situation but everytime i talk about food or something I enjoy she starts rambling about me being food crazy or that food shouldn't bring people joy like that. Heck she doesn't even fucking allow me to eat green or blue m&m's because the food coloring is bad or some sort of bullshit. Sorry its just really annoying and I'm wondering what can I do about this? Its geniuely making me upset seeing the way she acts with food and how she is basically giving me and my sisters eating disorders. We barely have any sweets or chips at homre and when we eat something like chips its only like once a blue moon when she allows us. Sorry this is all messy but how do I stop her from being so strict and ruining me and my sisters relationships with food? I might take this post down in a few hours in fear of people regonizing this post or me though. Its my exam week aswell so that also explains my lack of energy.