A major new study. This is an important point that too few pay attention to; it’s not about weight loss per se:
The 18-mo moderate weight loss of 3.7 kg was similar in both groups, but the reduction in waist circumference was higher in the MED/LC group (−6.9 ± 6.6 cm) than in the LF diet group (−2.3 ± 6.5 cm; P = 0.01). After 18 mo, the IPF volume had reduced twice as much in the MED/LC group compared with the LF group [−37 ± 26.2 mL (−22% ± 15%) compared with −15.5 ± 26.2 mL (−8% ± 15%), respectively; P < 0.05, after adjustment for changes in weight or visceral adipose tissue]. [My emphasis]
This is one reason BMI is BS. Another is that it doesn’t take into account the difference between muscle mass and fat.