What are Chronometer's Daily Mirco Nutrient Targets based on?
I am 51 yrs old and totally new to Cronometer. I am especially excited about the fact that Chronometer tracks all of the different vitamins and minerals so I can see how I am doing, what changes I can make to my diet to improve this, and what supplements I really need to take.
But I noticed that there is no concensus on the Recommended Daily Amount (RDA) of vitamins and minerals that we need. Chronomenter's amount is different from USDA publication , which is different from the RDA's on backs of all of the different multi vitamin bottles. Generally Chronometer's values seem to be lower than but pretty close to USDA. Multi-vitamin bottles reccommend much higher RDA's of most of the vitamins and minerals, which might be a marketing ploy? .. The units don't always match, so some amounts aren't always easily comparable.
So my questions are:
1. What sources are Chronometer's daily recommended nutrients based on? I thought it was USDA, but they are different from the USDA publication I saw.
2. Do these numbers vary with gender, age and size? Maybe Chronometer's numbers have been adjusted for the gender, age and size that I entered into my profile, so that is why they are somewhat close to but often slightly lower than the USDA values? I assume USDA values are based on an average sized man of average age, none of which I am.
3. What is the best source for this information? I assume USDA is the best source, but maybe there are better sources?