Science classes stretch marks as a form of scarring. Stretch marks are the consequence of skin being stretched further than its natural elasticity. This stretching interferes with the body’s collagen production. Collagen is what keeps the skin elastic and able to stretch as you gain weight. For preventing stretch marks during pregnancy it is essential to keep a close eye on weight gain. During pregnancy you need to put on weight as a normal part of the childbearing process but you should be mindful that you do not put on more weight than your doctor recommends. This does not mean that you should starve yourself throughout pregnancy to avoid your skin over stretching and forming stretch marks. Just take care to eat sensible, healthily and gain weight slowly. This allows the skin to gradually stretch and retain its elasticity. Taking light exercise is also useful for preventing stretch marks as you gain less fat, stay fitter and regain your figure quicker afterwards.