I generally steer clear of sugary junk food such as beer, fruit juices, etc. I'm not really a fan of drinking alcohol either, as I like my sleep. So when I go out with a bunch of work colleagues and they offer to buy me a drink, I ask for water. Which is quite awkward to be honest, as it feels like I'm declining their offer to buy me a drink, and additionally, they start to ask me if they can buy me an apple juice, etc.
At the end of the day I'm not sure if they think I'm super-religious, or if they think I don't want to socialize with them. Neither is good.
Is there a way to minimize the exclusion I get from the group by not drinking?
EDIT: In response to the question of "Why not just tell them the truth", the reason is that it almost always results in a discussion about whether fruit juice is good or evil, carbs, etc. as everybody in the world is an expert on diet and nutrition and wants to give you their advice, then somebody disagrees, and then you have an argument. (It even happened in the comments below!)