It's true that much of my cycling involves social stuff and eating. I have never expected to lose weight on tours where visits to gourmet restaurants are involved, but I do expect to be able to maintain my weight during normal week day and weekend riding.
I cannot ride and restrict my calories too much. I normally try and eat a low glycemic diet, but I absolutely have to add in some good carbs when I ride. It seems that I am at the point that eating a whole wheat bagel causes me to gain a pound! I don't want to obsess on my weight, but I have worked hard to still be thin at age 55. I's not effortless, as some people think.