Loss of appetite and vitamin deficiency

Eating less can reduce intake of protein, calories, iron, vitamin B12, folate, and other nutrients. Possible effects include tiredness, weakness, pale skin, sore or smooth tongue, mouth changes, tingling, or reduced concentration, depending on the nutrient involved. These signs overlap with many conditions and do not identify a deficiency on their own.

Risk can be higher with a very restricted diet, digestive disease, difficulty swallowing, repeated vomiting, alcohol problems, or medicines that affect absorption. A clinician may review your diet and health history and use targeted blood tests rather than guessing from symptoms.

Choose small, frequent meals containing a protein source and a variety of foods you tolerate. Fortified foods or a clinician-recommended supplement may help when intake is poor. Avoid taking large doses of vitamins without advice because some can interact with medicines or build up in the body. Record what you eat, drink, and any symptoms.

Make an appointment if appetite loss lasts, weight is falling, you feel increasingly weak, or you notice tingling, breathlessness, persistent diarrhoea, or mouth and tongue changes. Seek urgent help for fainting, severe weakness, confusion, chest pain, or inability to keep fluids down.

Ask which nutrient deficiencies are plausible from your diet and symptoms, whether blood tests are appropriate, whether a medicine or digestive problem affects absorption, and how to improve intake safely.