Does being vegetarian make you lose you ability to tan better?

I've been vegetarian for a year and a couple of months now, but this is my first summer meatless. I've notice I haven't been getting much color from the sun like i always did (I'm sicilian so genetically darker skin and tan very well) but this summer, already two months in I haven't received a tan and I lay out side all the time. COuld being vegetarian effect that?