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This makes it sound impossible for some people to get enough vitamin D from sun and food without supplements. If you're fair skinned and living in northern climates, you'll be deficient even with a healthy diet given that you can't be out in the sun that long without burning. Is the human body that defective?

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Wouldn’t it be if you are dark skinned not faired skin?

This is true, yes. But really both have issues. It takes much longer in the sun for a dark skinned person to get enough exposure to produce a healthy amount of D. But the fair skinned person burns readily, so they can't stay in the sun long without protection which would inhibit getting enough sun.

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