Do you actively comment on the amount of carbs, calories in food when you order. If so, you can keep track of those things without making it obvious that you are. Maybe the problem is that you talk about it? (if you talk about it) and that is what makes him think you are obsessing over food.
As far as the drinking, I can't help you with that because I don't drink either.
If he thinks you are wound up tight maybe it's things you are voicing rather than things you are doing?
I don't think there is anything wrong with a little give and take in a marriage. He wasn't required to know every little thing he might ever want out of you on the day you got married. People evolve and their needs change...although I wouldn't necessarily refer to his requests as needs.
It sounds like he's just concerned that you relax and have a good time and the things he mentioned are the ways he thinks would facilitate that. It doesn't sound like he's trying to turn you into a whole other person.
I would not make a big deal about this either. You are on vacation and vacation is not the time to interrogate each other. The point is to enjoy, not create issues. Discuss issues when you get home. Also if you are going to ask him how he came to these conclusions I do not suggest asking him if someone has been in his ear. IMO, you need to find a more stealth way to get the answer to your question if you want an answer without sounding accusatory.
Also, is this one of few times he's asked you to make these changes or is he asking you to change things frequently over the last 8 years. I think that makes a big difference.