Admittedly when my face (and overall body fat) is thinner I look a little older. I get that sunken, shallow eyed look and my cheek bones protrude outward. Not what I like, but sometimes I slip into a depression and forget to eat as much as I should. When I eat well and am a healthy weight for my height people mistake me for being a good 5 years younger than I am. I, and i'm sure many of us here, fear the skinny sunken look becoming permanent. The question is, in the absence of keeping our weight high when we enter our 30s or so, what can we do to keep our faces full looking? Believe or not I see a lot of people in their early 30s who look really tired, have pronounced lines and sunken, hollow appearance. Is collagen the only thing the provides this full look? Or is there more? Elastin? Hyaluranic acid? Fat stores? And how do we upkeep them all?