aken aback by the smell when you go for a wee? Often there are simple reasons for this, however it can potentially be a sign of something more serious.Diet and hydration can affect the appearance and smell of urine as can infection, medications, and certain medical conditions.When your body is dehydrated, the urine has a strong odour like ammonia and appears dark in colour,’ says Dr Sushma Srikrishna, consultant urogynaecologist at London Bridge Hospital.Certain foods like asparagus, Brussels sprouts, onions, some spices, garlic, curry, salmon, and alcohol can change the smell of your wee and a high-salt diet can also make your urine more concentrated, giving it a stronger scent.’Some supplements, especially those with water-soluble vitamin B6, can cause a pungent smell in the wee,’ adds Dr Srikrishna.On the other hand, Dr Srikrishna says calcium supplements and vitamin D may make urine smell fishy, while iron supplements and kelp can give it a metallic smell odour.