I didn't, but it didn't keep me from losing weight. (I had 20 lbs to lose and did it in about 3 months). I can't say I made any strength gains during that time (but my workouts weren't consistent either, due to time/energy constraints with 3 small children).
Currently, I am trying to cut some more fat while maintaining muscle and am encorporating some WW principles....I stay in my point range and make sure each of my 3 main meals have some protein in them. I know I am not getting as much protein as when I am not doing WW....I think if you are trying to make strength gains, you may have to eat more. The whole question..."I have to eat less to lose fat, but eat more to gain muscles...so what do I do"...problem.
I have been eating a lot of chicken and fish....the lowest pts foods that have protein.
Hope this helps
Jen