A United States Institute of Medicine report states: "Outcomes related to cancer , cardiovascular disease and hypertension , and diabetes and metabolic syndrome, falls and physical performance, immune functioning and autoimmune disorders , infections, neuropsychological functioning, and preeclampsia could not be linked reliably with calcium or vitamin D intake and were often conflicting."  : 5 Some researchers claim the IOM was too definitive in its recommendations and made a mathematical mistake when calculating the blood level of vitamin D associated with bone health.  Members of the IOM panel maintain that they used a "standard procedure for dietary recommendations" and that the report is solidly based on the data. Research on vitamin D supplements, including large-scale clinical trials, is continuing. 
A 2010 study revealed that a decrease in T explained much of the loss in phase III and IV sleep, or "deep sleep" that is characteristic of aging males.  At age 50, men spend 5-7 percent of their sleep time in Phase III and IV and by age 60 it is nearly zero or nonexistent. Young men, on the other hand, spend 10-20 percent of their total sleep time in these stages due to neuronal integrity and abundant testosterone levels.
Wondering about the lack of veggies on this list? That’s because B12 is found almost entirely in animal products; vegetable sources have negligible levels of the nutrient. Sorry, vegetarians, but that extends to regular tofu, which is a good source of protein — but zilch B12. The exception is fortified tofu, such as Nasoya Tofu Plus, which is pumped up with additional nutrients, including B vitamins. A 3-ounce portion also contains 7 grams of muscle-friendly protein. If you’re a vegetarian or vegan whose libido has gone limp, you may want to do a cost-benefit analysis of tofu as a protein source and consume it sparingly, as some studies have shown that it can lower testosterone levels. If you’re concerned, you can always double down on these testosterone-boosting foods .