Final answer:
The statement that people who wear a heavy coat of a high SPF sunscreen all the time could prevent their bodies from making adequate amounts of vitamin D is true. Sunscreen blocks UVB radiation, which is necessary for the skin to produce vitamin D. Without sufficient UVB exposure, the skin can't synthesize enough vitamin D, potentially leading to deficiency unless compensated with diet or supplements.
Step-by-step explanation:
Consistently wearing high SPF sunscreen can inhibit vitamin D production by blocking necessary UVB rays, potentially causing deficiency if not offset by diet or supplements. Vitamin D is vital for bone health, preventing conditions such as rickets and osteoporosis. While excessive UV exposure can lead to skin damage and increased risk of skin cancer, a moderate amount of sunlight is essential for vitamin D production. Melanin, the pigment that gives skin its color, naturally protects against some UV damage while darker skin tones may require more sun exposure to produce an equivalent amount of vitamin D when compared to lighter skin tones.
It's important to balance UV protection with the need for vitamin D. The American Academy of Dermatology recommends obtaining vitamin D through food and supplements if adequate sunlight exposure is not possible. This is particularly necessary for those with darker skin, individuals living in northern latitudes, or those who consistently use strong sunblock.