The phrase "to support one's weight" means that something is helping you stay balanced or not fall down by holding the pressure or force of your body. Full definition
This helps support the weight of your belly and also limits and prevents stretch marks. (twiniversity.com)
For women, having the right amount of estrogen supports weight loss efforts because it decreases fat storage on a cellular level. (fitnessandpower.com)
It can be made to easily help support weight loss results instead of having users conform an often tedious, and potentially difficult to maintain diet plan. (dietsinreview.com)