As far as what was measured, along with some psychological testing was body fat percentage (by means of DEXA), and of course weight.
The results? After 5 months of genuinely heroic amounts of exercise,
"no signiﬁcant changes were observed for the BMI and percentage of body fat"The good news is that the kids felt better about themselves with improvements to their body image and self-esteem, and I've no doubt, they also likely improved their health (blood pressure, lipid profiles, exercise capacity, etc.).
If your kid's weight is a concern, help it with your kitchens, and then when you're done washing the dishes, head outside with them to play.