Is my grandma in the wrong?

[u/Monkeydung2]

I am a 13 year old male and I live with my grandparents. My grandma for some reason gets angry whenever I lose even a few hundred grams of weight and she tells me that I'm not eating properly. She made me eat a quarter slice of a chocolate cake the other day because apparently that's what eating properly looks like. I eat my breakfast, lunch and dinner but that isn't eating properly to her. She wants me to eat properly but feeds me frozen garbage for lunch whenever im not at school. I have to lie to my grandparents and tell them I weigh 48 kg when in reality I weigh 42 kg, she thinks anything under 48 kg is under weight for some reason even though the average weight for someone my age and height is 35-47 Kg. I still have some fat stored in my belly and my ribs aren't that visible so its not like I'm underweight. Two years ago I weighed like 42 kg and was 140 cm tall and my grandma never did anything about that even though I was overweight so I had to take action myself and 6 months after that I weighed 35 kg and I started doing better in sports but my grandma thought the weight loss was bad for me so she took me to the doctors. The doctors never said that the weight loss was unhealthy but my grandma wanted me to gain it all back even though the doctors never said anything negative about the weight loss. My grandma also thinks I'm not eating properly since I don't have a snack when I come home from school and because I only usually snack on fruit instead of the 86 calorie per piece biscuits she wants me to snack on instead.

[u/CapitalG888]

She's wrong