In depth

Guides

Longer, plain-English explainers that go beyond the reference entries — how to make sense of nutrition, deficiencies and food safety.

Allergies & safety

Food allergy versus food intolerance: how to tell the difference

They cause overlapping symptoms but are completely different things — one involves the immune system and can be life-threatening, the other does not. Here is h…
Vitamins & supplements

Can you take too many vitamins? Understanding safe upper limits

More is not better. Some vitamins are stored in the body and become toxic in excess, and even water-soluble ones can cause harm at high doses. Here is how uppe…
Deficiencies & testing

When deficiency symptoms need a blood test — and what tests can and cannot tell you

Tiredness, hair changes and poor concentration can point to a nutrient shortfall — but they have dozens of other causes. Here is when to get tested, and how to…
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