This is quite an engaging topic.
Life might not give us what we work for neither is it guaranteed. So when I see people enjoying the moment to the fullest, I just smile.
You can decide to starve yourself of so many pleasures now, to enjoy a healthy future but what if that future never comes and life is unexpectedly stolen from you, what next?
Personally, I'd say: Just enjoy yourself but do so in moderation. Too much of everything is bad!