Food addiction in the family

I’ve struggled my whole life with my weight and body image. I’m 5’1” and weigh 129 lbs after a journey of going low carb. I still have more to lose and working towards that goal. However every time I go to my parents house they keep offering food to me and get VERY upset when I don’t eat. I went to visit my dad from 12-3 and the whole time during this visit he was eating in the kitchen, not playing with my son. Then he was trying to challenge how that “your diet is not healthy and doesn’t work, but if it works for you then good for you.” I simply told him I feel much better without cookies, cakes, breads, and pastas because I once I start eating I can’t stop even after I’m full. Then he gave me a large bag of nuts and said “you can eat this on low carb. Eat some with me and take the rest of the bag home” even after I said I have nuts at home and trying to stay away because I can’t stop eating them. It’s a trigger food for me but I took the bag anyway because he would’ve been very upset and offended if I didn’t and at home I finished the whole bag in one sitting. I gained a few pounds now and just emotionally, mentally, and physically drained from my family’s food addiction influence and the fact the I’m guilted and bullied into eating or taking food home is really not normal. How can I start standing my ground? I don’t want to avoid visiting my parents but food is a big issue with my family. I already told them I am no longer eating for pleasure and I’ll eat when I have to or feel hungry. Anyone can relate?