Let me just point out that a lot of the foods in the database (particularly the user-entered ones) have inaccuracte/incomplete information for the "vitamins and minerals" - so you may be getting more potassium/calcium than your tracker is suggesting. Also, many food nutrition labels don't even list potassium at all, even though the food may have some! Lastly, you may find that you are getting vitamins and minerals from unexpected places that you aren't even tracking - dried spices for example, do contain some nutrition, but most people wouldn't bother to track them.
That said, it can be really hard to consume enough calcium-rich foods to meet the RDA, when eating a calorie-restricted diet. A big winner/saviour for me has been "dark leafy greens" like kale and swiss chard.
Goal 1 - break 200 (46 pounds lost)**DONE**
Goal 2 - leave obesity behind (BMI 29.9, at 185#) **DONE**
Goal 3 - BMI = Normal (154# or less)
| current weight: 172.5