I want to start a business but can't think for the life of me what to do? I am a nutritionist but flexible!

I have a feeling that I would like to be in business but am a little short on original ideas. I am a nutritionist (public health sort) but am pretty open to ideas and am by no means stuck on my profession. I have also worked as a manager for some years and consider that I am ok at that. I have spent several years working abroad, in China, Darfur, South Sudan and recently Malawi. Now I want to settle back home. I have thought of trading in organic fruit and vegetables but it is hardly original. I have thought of trying a whole food type restaurant. I am in need of some inspiration and something that would fire me with enthusiasm! Many thanks for suggestions.