Wow, you're at 170 lbs, with an approx 2000 cal and 120g carbs daily intake. Not good my friend. I can't believe your numbers are so low. I don't think I was that low the week before my last contest. I find that too many people seem to drop numbers too drastically in an attempt to rip up quickly.
What then essentially happens is you not only lose muscle, but your body downshifts as well, eventually digging yourself a nice slow metabolic hole. You will lose fat by making your body have to adapt to things it's not used to. A low carb day here, a higher one there, a lower cal intake for a few days, but then a higher one so it doesn't adjust to the lower intake.
A few thoughts:
- Carbs are your best defense against muscle loss, which is why you don't see too many natty BBers going low carb for extended durations.
- Protein has a 'thermic effect', so you can eat a little more protein than carbs even though both technically yield 4 cals each gram.
- Fats will slow the digestion of food in your stomach.
-I usually advice someone who 'stalls out' to up their numbers, no lower them. Usually they've crashed their metabolism by following poor advice for too long (their leptin levels also need resetting).
(Everytime I see some 150 lb guy advising to cut carbs to rip up I just wanna smash my head into my computer screen!)