I dont think there is anything detrimental to that. If anything I'd think it'd be benifical. You know exactly whats going into your body each day. Infact when I was in the best shape of my life I ate the same foods for 10 weeks straight. Only thing I would change is the amounts. I felt it became routine and much easier to stay on track and know when it was time to take out/add in. Know what I mean?