Why is my boyfriend and his mom against me taking weight loss supplements?

I had told my boyfriend that I invested in weight loss supplements and he seemed to be ok with it then as soon as I told his mom about it she was against it and since then my boyfriend is against me taking weight loss supplements and even said he would throw them out if he saw me taking them again cuz he thingks they’re going to make me “sick”….. im 20 pounds overweight and my bfs parents seem to make comments that me and my boyfriend should be going out for walks…..

so what’s the problem here? Why is my boyfriend so opposed to it?

Jealously of me becoming attractive to other guys
Doesn’t want me getting sick
Both /other - please explain
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Why is my boyfriend and his mom against me taking weight loss supplements?
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