What is a common effect of excessive sun exposure on hair?

Excessive sun exposure has a well-documented impact on hair health. When hair is frequently exposed to the sun's ultraviolet (UV) rays, it can lead to significant dryness. This is because UV radiation depletes the hair of its natural moisture, which can result in a rougher texture and a dull appearance.

In addition to dryness, prolonged sun exposure can also lead to a loss of color vibrancy in dyed or naturally colored hair. The UV rays can break down the chemical bonds in hair dye, causing color fading. This is particularly notable in lighter shades, which may become brassy or washed out due to significant sun damage.

The other options present effects that do not accurately reflect the consequences of excessive sun exposure on hair. For example, while natural highlights may occur for some individuals due to sun exposure, they are not a common or primary effect, and they do not offset the negative impacts like dryness or color loss. Similarly, strengthening of hair follicles is not a response to UV exposure; instead, hair health can be compromised. Increased shine and vibrancy are also not results of overexposure to sunlight, as these qualities typically diminish under harsh conditions. Thus, the correct answer emphasizes the detrimental effects of too much sun on