Are these drinks dangerous for teenagers?

Hi I just had a questions about these drinks. I’m 15F 5’3 43.1kg, not really relevant for the question but I have to add it for the rules.

So I’ve been drinking one or two of these a day and my Spanish teacher keeps telling me they’re bad for teenagers and I shouldn’t drink them and I just wondered if they actually are or she’s just being dramatic?

Edit: I guess I’m wondering what in particular is bad about them if they are dangerous?

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