Speaking as someone who spent quite a few years being overweight, and then lost a lot, I can truthfully say that there's definitely something to guys not being as attracted to a heavier female. I'm now within 20 or so pounds of my goal weight and getting the attention is actually scary because I never know how to respond. Everyone else learned this at a young age while I was heavy and getting no attention, so yes, I'm a bit behind the curve, and a tad naïve because of it! Just be yourself, and be engaging.