Arizona Esthetics State Board Practice Exam

Sun exposure is considered the number one factor for extrinsic aging due to its significant impact on the skin's health and appearance. When skin is exposed to ultraviolet (UV) rays from the sun, it can lead to a variety of changes that accelerate the aging process. These changes include the breakdown of collagen and elastin, which are crucial for maintaining skin’s firmness and elasticity. Additionally, UV exposure can cause pigmentation issues, such as sunspots or uneven skin tone, as well as increase the risk of skin cancers.

In contrast, while pollution, diet, and stress can also contribute to extrinsic aging, their effects are generally considered secondary to that of sun exposure. Pollution can lead to oxidative stress and inflammation, diet can influence skin health through nutrition, and stress can affect skin conditions due to hormonal fluctuations. However, the overwhelming evidence points to sun exposure as the leading cause of premature aging, making it essential to incorporate sun protection into an effective skincare regimen.