 [ Symptoms ] on nurtisystem for 35 days lost 20 pounds a1c from 6 0 to 8 1  after being on the nutrisystem diabetic program for men for 35 days and losing a total of 20 pounds my a1c went from 6 0 to 8 1 i am 5 7 and a current weight of 177 2 pounds why would my a1c increase was it due to the previous 3 months [ Disease ] there could be a few things going on did you change or alter your medication if you are on medication also as you say a1c is an average over 3 months so how you were eating the two months prior makes a difference it is also possible your carbohydrate intake was lower before starting the diet and the increases changed your blood sugar i would see a diabetes educator while you work at getting to the right weight for you they can help guide you in the process good luck