I would be shocked if there were any large differences in nutrition requirements by black people. Or asian, or any other ethnicity. Soylent is about meeting nutritional needs for the human animal, and I’ve never heard of any nutritional differences of the type you’re concerned about. You’ll have a wide spectrum of differences based on height, weight, gender, lifestyle, illness, and metabolic quirks, but black people are going to fit into the same spots along that spectrum as white people. Soylent was designed to cover a broad range of that spectrum.
I would talk to your doctor and begin by saying “so what would it do for my health to have a perfect diet, with all the vitamins and minerals?” and don’t even bring up Soylent until the end of the conversation. He may have some specific, targeted recommendations based on your personal medical history. If he says “because you’re black, you have X and Y different nutritional needs” ask him to explain those differences. Personal and family medical history are going to play the largest role.
I do know that black people in America, as a population, have a different set of risks and medical concerns, statistically speaking. That being said, those concerns are not based on race, but genetics, or culture… African Americans of non sub-Saharan descent have a similar incidence as other populations of sickle cell anemia, for example. And there’s a sociopolitically skewed ratio of lower income African Americans resulting in a false correlation of diabetes incidence when the real reasons are being low-income with limited access to good nutrition. Adjust the studies proportionally and those numbers line up to the expected rates for humans in general.
If you’re of average height, weight, and build, then Soylent as is should be great for your diet. If you’re smaller, you may need to lower your serving size. If you’re larger, you may need to supplement macronutrients. If you have specific medical conditions, Soylent gives your doctor a chance to target your needs in a precise way.
I’ve read a ton of nutritional studies and books and articles over the last 5 months. Talk to your doctor, and I’ll bet he gets excited. The only nutritional concern I’ve ever seen brought up is for Vitamin D3 levels, and recent studies suggest that getting the RDA is sufficient for any individual, regardless of race, and that there is a tendency to overdiagnose D3 insufficiency in the african American community.