five major types of collagen, each fulfilling a different role within the body. As we age, mutations in collagen can alter the expression or primary structure and function. As a result, this decline in collagen affects our connective tissue such as joints, ligaments, bones, skin, and even affects our gut health! Our modern eating habits and lack of movement also contribute to this collagen decline. Finally, cortisol released during stress also increases the breakdown of collagen. Decreased collagen can put us at risk for a number of health issues.