I suggest you use Cronometer.com for a few weeks or days and see if you actually reach the RDA of 400mg a day. My guess is you don't from food alone unless you

I suggest you use Cronometer.com for a few weeks or days and see if you actually reach the RDA of 400mg a day. My guess is you don't from food alone unless you eat a lot of pumpkin seeds and nuts that are magnesium rich every single day. Most people are deficient in magnesium.