The whites of my eyes are turning yellow and I am concerned it may be to do with my consumption of alcohol. Or is it related to another part of my diet?

When the sclera (white of the eye) appears yellow, it indicates that your liver needs support. Jaundice is a possibility, so check with your GP. Digestive problems that lead to flatulence or constipation mean there will be raised levels of toxins in your gut, stressing your liver. Toxins in alcohol, drugs and food additives can also stress it. Yellowy fatty deposits on your sclera, meanwhile, show poor fat metabolism and high levels of bad cholesterol. This is also evident if you have a white ring around the iris. I advise you to visit an iridologist (someone who detects what is going on in the body by looking at the eyes) who is also a nutritionist; contact the Guild of Naturopathic Iridologists International on 020-7821 0255 or gni-international.org.

My nephew, who is 10, has suffered from asthma, eczema and croup since he was a baby and lately gets seasonal allergic conjunctivitis. Is there anything that will reduce his chances of getting this again?

Allergic conditions do not happen in isolation but are a sign of a general imbalance. There are no instant solutions - his susceptibility to respiratory problems and allergies needs to be addressed holistically to undo the pattern that has developed. Homeopathy would be my recommended treatment, managed in close consultation with a good therapist who will be able to strengthen and rebalance his body and nudge his immune system into greater responsiveness. Contact the Society of Homeopaths on 01604 817890 or homeopathy-soh.com.

· Emma Mitchell is a natural health therapist. Before following Emma's recommendations, you should consult your GP about any medical problems or special health conditions.

Send your questions to Wellbeing, Guardian Weekend, 119 Farringdon Road, London EC1R 3ER. Email: ask.emma@theguardian.com.