As your previous link mentioned, not all of Africa is equally sunny. But really the difference is that people with darker skin need to spend more time in the su

As your previous link mentioned, not all of Africa is equally sunny. But really the difference is that people with darker skin need to spend more time in the sun to get enough Vitamin D. At least one source says folks with very dark skin need six times as much sunlight as those with very light skin. I've seen 3 hours daily recommended before as well. It's going to be challenging for an urban person at any latitude to get that much sunlight in a typical day. https://health.usnews.com/wellness/articles/2018-07-18/how-much-time-in-the-sun-do-you-need-for-vitamin-d https://health.usnews.com/wellness/articles/2018-07-18/how-m...