Classmate wants us to do unhealthy diets?

Anonymous
Hi, I am a 7th grader and since 2 weeks ago my classmate started dieting and wants everyone to join her.
One day she came with a copy of the Abc-diet (it is very unhealthy and you are only allowed to eat like 500 calories) and now everyone is on that diet. It is so annoying because they constantly talk about low calorie food and they also tell me if I am aware that my lunch has like 400 calories. They meet each other in the afternoons to work out (without me) and I feel lonely because now I have nobody to meet with.
I think this is getting out of control and it needs to stop but I don't want to tell someone because then everyone will hate me :(

What should I do?
Classmate wants us to do unhealthy diets?
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