30% of those diagnosed with type 2 diabetes have a normal bmi. But a normal bmi is quite a wide range, from 18.5 to 24.9
According to my height 188cm, from going to the lower end of bmi to the higher, my weight could be everything from 65 kg to 88 kg, this is a 23 kg range, and still be considered a normal bmi. And this figure also says nothing about my bodycomposition, I could very well have a bmi of 20, but a bodyfat of 25% which would classify my as an obese person in terms of bodyfat.
look at this picture. These are two famous professors in diabetes research, they measured bmi and bodyfat in lots of people in both India and England,and compared the results, they also tested themselves. by coinsidence they both had a bmi of 22.3, but the one to the left has a bodyfat of 9% the one to the right 21% ! Same bmi,nearly double the difference in bodyfat!
Also look at this chart, which shows how bmi and bodyfat is not necessarily correlated.
16% of women have a normal or underweight bmi, but bodyfat of over 35%, counting them as being obese.
6% of men had the same figure but their limit for obesity in terms of bodyfat is 25%.
3% of women had bodyfat of under 35%, but overweight bmi, and the same figures for men where 12% again with the limit at 25%.
Also look at this history.
This man had a Bmi of 21 at a height of 5 feet 7 inches(170 cm) , when he got diagnosed with diabetes type 2. He when went on the newcastle diet, and and reached a weight of 56 kg, giving him a bmi of 19.4. He then got sugars like a non-diabetic, and he does not eat a lowcarb diet, but a rather silly one, he belives saturated fats are bad for instance. But again, weight is the important thing, but far more imporant is where the fat is stored and lost.
Also Type-2 store fat in abnormals places like the liver,pancreas, and as visceral fat, which is tge cause type 2, people which not do not get diabetes, however large their bmi, do not store fat this places.
Roy Taylor did a brilliant study that showed this.
Individuals listed for gastric bypass surgery who had T2DM or normal glucose tolerance (NGT) matched for age, weight, and sex were studied before and 8 weeks after surgery
Weight loss after surgery was similar (NGT: 12.8 ± 0.8% and T2DM: 13.6 ± 0.7%) as was the change in fat mass (56.7 ± 3.3 to 45.4 ± 2.3 vs. 56.6 ± 2.4 to 43.0 ± 2.4 kg). Pancreatic triacylglycerol did not change in NGT (5.1 ± 0.2 to 5.5 ± 0.4%) but decreased in the group with T2DM (6.6 ± 0.5 to 5.4 ± 0.4%; P = 0.007). First-phase insulin response to a stepped intravenous glucose infusion did not change in NGT (0.24 [0.13–0.46] to 0.23 [0.19–0.37] nmol ⋅ min−1 ⋅ m−2) but normalized in T2DM (0.08 [−0.01 to –0.10] to 0.22 [0.07–0.30]) nmol ⋅ min−1 ⋅ m−2 at week 8 (P = 0.005). No differential effect of incretin secretion was observed after gastric bypass, with more rapid glucose absorption bringing about equivalently enhanced glucagon-like peptide 1 secretion in the two groups.
CONCLUSIONS The fall in intrapancreatic triacylglycerol in T2DM, which occurs during weight loss, is associated with the condition itself rather than decreased total body
In short, type diabetics lost fat from the liver, nondiabetics did not despite the fact that both the control and diabetic group lost the same amount of weight!
So yeah, diabetes and prediabetes can be reversed as long as you loose enough fat, and the fat needed to be removed is highly variable largely dependent on genetics. You could of course be a LADY or Mody, and I feel for you, those groups are really let down by the medical community, but a standard type-2 would reverse his condition like the thin man described in the daily mail article.