Well, a piece of fruit the size of a tennis ball is considered a 15 g serving of carb, that's because it contains fiber. So having your apple is good. One key piece of advice that I have from the registered dieticians I work with is that if a diet limits you on your intake of healthy foods such as fruits and veggies, it's a sign it's a bad diet! (Especially veggies! But fruit also if you do not have diabetes.)

I have a co-worker who goes on these crazy fad diets. She's not even very over weight, maybe 15-20 lbs if that. Anyway, she was once on a diet that didn't allow her to eat any veggies at all.... and she had to take vitamins instead. Such a diet is extremely unhealthy and should be avoided at all costs! Of course, she doesn't listen to anyone unless they are an advertisment.