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Feeling tired, losing weight unexpectedly or noticing changes in your hair can prompt a useful question: am I getting enough nourishment? These symptoms can occur with undernutrition, but they do not identify a particular deficiency on their own. Illness, medicines, stress and sleep problems can also play a part. Improving meals and getting the cause checked can belong in the same plan. Fruit on a market stall, October 2011. Photo: Emeraldhorticulture, Wikimedia Commons , used under CC BY-SA 3.0 ; no crop. Food variety can support a balanced diet, but a photograph or symptom checklist cannot diagnose a nutritional problem. Weight loss and a falling appetite deserve attention The NHS lists unintended weight loss , reduced appetite, weakness, poor concentration and slow wound healing among possible signs of undernutrition. A person can be malnourished even at a weight considered healthy or while overweight. Appearance alone is not a reliable nutritional assessment. If you keep losing...