Since the Nutrition Facts label lists only the items that are required by law to be listed on food products, Potassium, Ca, Mg and folate may be listed as percent daily values, but not exact amounts. They also aren't listed in the data base. This will make your reports inaccurate unless you are entering the nutrient amounts yourself using a more comprehensive tool. If it is important to have accuracy with micronutrients because of a medical condition, you can enter each food item yourself (and save in your favorites for easy access moving forward) to include all nutrition information. The food list from the USDA can help.
As you have discovered, a lot of foods don't have certain nutrients listed. I wouldn't worry tying to track them because it will only niggle at the back of your mind that you aren't getting enough. If you are still concerned, talk with your Dr, and perhaps ask for a referral to a Registered Dietitian. By taking some print-outs of your Nutrition Daily Reports, he/she will be able to advise you if you aren't getting enough, or set your mind at rest if you are!
I set my nutrition tracker to track vitamins/minerals, and it always tells me I'm low on magnesium. However I have realized lately that a lot of foods don't actually list the magnesium content in them. For example I had baked beans for dinner and I know these have magnesium but it wasn't listed; or cereals. So how can I tell if I need more magnesium? Since it is not giving me a real tracking of how much I am getting? I know I don't often eat a lot of the types of things that are high in it, like beans, or certain grains....
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