There is no evidence to suggest that Caffeine and Alcohol will affect the longevity or result from fillers however other lifestyle conditions do. For example, excessive sun exposure stimulates enzymes that break down collagen in your skin which also makes the results you see from the fillers go away faster. Smoking also affects the aging process and therefore how quickly the nice results from filler will dissipate.I hope that helps!
I know of no studies that suggest caffeine or alcohol have any effect on Juvederm longevity. Best of luck.