Should I stop my boyfriend from drinking Sprite?

My boyfriend is drinking Sprite non stop and it's disgusting how he has a 24 pack in his bedroom drinking it down like it's freaking water. I've told him that he needs to start drinking water, juice or tea and he thinks I'm playing with him when I told him I will dump it down the drain and throw it away. All I care about is his health, what should I do?
Should I stop my boyfriend from drinking Sprite?
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