This is like saying water makes trees grow. Yes, loosing weight means consuming less calories. The body moves calories around as glucose. High glucose = weight

This is like saying water makes trees grow. Yes, loosing weight means consuming less calories. The body moves calories around as glucose. High glucose = weight gain (and above a certain limit you can't gain weight faster and then you look like type 2 diabetes). Keeping your glucose near floor (there's a lot of biological controls that keep glucose above 80) = weight loss.