Yup, no need to use the "A-word" so early. It can be foul language to some due to misconceptions. Just eat how you eat and he will accept you, I'm sure. A lot of people eat for their health and are not condemned for it. I'm sure he will be understanding. Not to mention... it's not that hard not to stand out. People at my office see me eat food all the time and don't suspect I'm a low-carber. They know I turn down sugar, cookies, cake, etc. but that has no stigma attached. I mean, people know sugar isn't healthy.

Anyway, I'm sure all will be well. Good luck on your date, I hope things work out.