Hear Hear
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foodcourts meals are alright.. plenty of carbs and chickens and pork and beef for proteins and minerals and usually plenty of vegs too. Very well-balanced, except for too much salt, too much sugar and too much oil. Nothing deficient in foodcourt meals. only excesses.

low in minerals and Vits?
U&E ie BUSE will give you sodium and potassium levels, bone profiles will give you calcium and phosphate and Mg2+ levels will give you magnesium. you can ask for 'vit D' levels and the lab will give you 25(OH)VitaminD levels which correlates with VitD3 levels ie cholecalciferol ie the things that you need. All these in just one blood test consisting of 2 gold-topped bottles.

dont be worrying about deficiencies, worry about excesses. do your body a favour and go check your cholesterol esp HDL, LDL and Triglycerides.