I saw a video of a Doctor explaining it is not sufficient to rely on sunshine for your Vitamin D. Especially if you don't live in a very sunny area. People who do live in sunny areas often are darker with more melanin. The melanin doesn't let the sun in, protecting their skin. Lighter people try to avoid sun to prevent sun damage and skin cancer. The more north you are, the less sunshine.
The reason people become ill in the fall and winter is twofold:
Viruses thrive in cold temperatures
There's often less sun, so you're getting vitamin D in very small amounts.
The vitamin D isn't there to boost your immune system.
Do you go outside?
Getting enough vitamin d is crucial for health. So if exercise. Make sure you're going outside.
I saw a video of a Doctor explaining it is not sufficient to rely on sunshine for your Vitamin D. Especially if you don't live in a very sunny area. People who do live in sunny areas often are darker with more melanin. The melanin doesn't let the sun in, protecting their skin. Lighter people try to avoid sun to prevent sun damage and skin cancer. The more north you are, the less sunshine.
The reason people become ill in the fall and winter is twofold: