I take it your on SS? It's difficult if you're hiding it. I was at a wedding yeterday and had to cautiously move things round my plate to make it look like i'd been eating. My mum and my hubby know that I'm on it but my dad would go mental cos he just doesn't understand. Sorry, a bit OT there. You can either tell a little porky - going out for a big dinner at night, not feeling well etc. Or just tell them you don't want anything.
I told my colleagues for 2 reasons - 1. so that they can have a dig if I ever cheated, and 2. so that I didn't have to hide myself when I was having a shake or soup. A couple of them have said stuff but I just remind them it's my life and my diet. If it was truly bad for me then it wouldn't have been going for all these years. And it's not as though I'm asking them to do it