I would also avoid all monosodium glutamate in processed foods.

Some people get blurred vision, overly thirsty and headaches from this. MSG....learn to read labels.

It is really difficult to get excess magnesium from foods.
It is really difficult to get the RDA of magnesium daily in fact.
70% of people only get about 1/2 of what their bodies need to run efficiently.

There have been food threads here before. I suggest you use the search function here-- it is on the first page of MG forum and type in "food" and see what comes up.

The warnings about EXCESS magnesium have come in fact from dosing massive amounts in women with eclampsia of pregnancy where their blood pressure skyrockets and they can die from seizures. It was found that the massive bolus dose of magnesium sulfate, triggered latent MG in a few women several years ago. This they led to the generalization that excess magnesium was harmful to MG patients.

Magnesium in foods is released slowly during digestion...so it is the safest way to get daily magnesium. Supplements release the mag quickly and flood the system briefly and this is to be avoided. The RDA for adults for magnesium is 340-400mg a day elemental.