The number on your scale represents your total weight, not the relationship of fat to muscle or the body composition. While being overweight is a risk factor for type 2 diabetes, it is not the critical risk factor. Correctly stated, it is increased body fat that is associated with type 2 diabetes, not increased body weight. While there is a strong correlation between body weight and body fat content, people of normal body weight can develop type 2 diabetes if they have an increased body fat percentage, especially if that excess fat is collecting around the waist or gut. That spare tire, or accumulation of fat around your middle, can lead to what is referred to as "metabolic obesity."
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