.....One of your co-workers nearly jumps over the wall of your cubicle at you because he's following low fat and starving (but not losing weight) while you're sitting there munching a pork chop fried in butter and olive oil and dropping weight like crazy!

.....The cashier at the store looks at your weekly grocery purchases and comments, "Oh, you're on THAT diet."

....Your DH and half of your co-workers want to know how to low carb because they've seen how much weight you've lost and how much better you're looking (not to mention all the stuff you can eat and still lose weight).