Soy sauce is a great diet choice because you'll only get few calories from it, when for example, it's used with your chicken breast as a marinade.
But you asked if there is some negative effects if used on a "perfect" cutting diet... so my answer would be yes! In fact, the Soy sauce is a simple carb source (Sugar) so if you want to diet to the extreme, I'd say don't use it. That being say in my opinion there is a whole lot of things to cut from your diet before cutting those 2-3g of sugar per portion...
AWESOME! That's exactly the information I was looking for. My goal is a "perfect" 12 week cut, so since I already cooked up about 4 days worth i'll use it, then cut it completely. Thanks guys I appreciate it!
God grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference.