– Why does being in the sun drain so much energy?

Question

To me 5 hours in the sun just walking is like 12 hours of working construction indoors. What causes this effect?

In: 165

Answer 1

UV induces damage to your DNA. The integrity and stability of your DNA in each cell is essential to life, therefore your body spends a lot of energy repairing them. That’s why you’re exhausted after for example a beach day, even though you’ve done nothing except lay in the sun all day.

I did my first two years of graduate studies in DNA repair mechanism.