8 months ago my a1c was 5.4 is it possible for it to become diabetic stage that quick if i was eating unhealthy ?

Unlikely: It is not so much eating unhealthy as much as gaining weight. If you gained a lot of weight, have increased urination, and increased appetite, it would be prudent to get it rechecked. Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.