My sister has recently changed her diet to almost paleo although she has been advised by her nutritionist to still eat lentils and some legumes. She has had a great response and was feeling fantastic for many weeks. However for the past two weeks she has had a terrible sore throat which she says goes from her throat to her ears. She has occasional knee pain also, but this subsides after exercise. I've done some research but can't quite get a clear understanding. My only thought is she is lacking in a micronutrient? She's 38 and a fit and healthy mother of three. Help!!