Why Your Balanced Diet Might Still Need Supplements—and the Risks of Overdoing It

A balanced diet can provide most essential nutrients, but certain groups may still need supplements. Experts warn that self-prescribing high-dose vitamins can cause serious health risks. Regular blood tests are advised to check for individual deficiencies or excesses.

Whole grains like oats, quinoa, and buckwheat are packed with B vitamins, though they lack B12. Green vegetables such as broccoli, spinach, and arugula offer magnesium, calcium, and vitamin K, along with folate and sulforaphane. Legumes, tofu, and tempeh contribute amino acids, iron, and fibre, supporting digestion.

Orange and red vegetables supply beta-carotene, while purple foods contain polyphenols and anthocyanins. Walnuts, flaxseeds, and avocados help restore omega-3 levels. A varied weekly diet is recommended rather than eating everything daily.

Supplements are useful for older adults, teens with poor diets, and those recovering from surgery or chemotherapy. Vegetarians and vegans often lack iron, zinc, B12, iodine, and L-carnitine. Overweight individuals may have hidden issues like high blood pressure or glucose intolerance, even if they feel well.

Excess vitamin D can cause nausea, heart problems, and kidney damage. Too much vitamin E raises bleeding risks, while high-dose vitamin C leads to bloating, diarrhoea, and kidney stones in vulnerable people. Long-term supplement use may increase heart attack risk by around 20 percent.

Most middle-aged, healthy individuals with balanced diets and exercise routines don't need supplements. Common deficiencies include vitamin D3 in winter, zinc, magnesium, and omega-3s. Blood tests help identify personal needs, preventing both shortages and dangerous overdoses. Experts stress caution with self-prescribed high-dose vitamins due to potential severe side effects.