I'm worried about this too, I have a couple of stretch marks where I never used to... I saw one on my boobs recently and have hardly taken my bra off since! I'm following most of the advice, I HATE water, so am trying to keep myself hydrated in other ways, unsweetened tea etc. I must go through 10 mugs of that a day. I moisturise without fail every time I have a shower. I try to get some gentle exercise every day (just walking, sometimes 1/2 mile, sometimes 6 miles) to keep the circulation going. One thing I have heard is that leafy green veg (spinach, broccoli etc) helps stimulate collagen production or something? It does something to keep the structure of your skin intact? I'm not sure what the nutrients are for that, but it's making me want to start drinking wheatgrass shots in the morning as I don't get enough salad down me. Might be worth a google to see if that helps in prevention