Globulin nml but is decreasing urinalysis nml and grf remains between 80-97 depending on my diet for 10 years. could low carb diet cause this or what

Looks normal to me: These values are essentially normal. A low carbohydrate diet should have no influence.

What is the problem?: Glomerular filtration rate estimated from a spot serum creatinine means very little; bodybuilders are all in early kidney failure. If your globulin is reasonably close to the normal range, and your Albumin is as well, i would not be concerned especially if your physician is not.