I'm on phone so this isn't easy but I'll try to help you understand what these organizations are:
The American Journal of Clinical Nutrition (AJCN) is the most highly rated peer-reviewed research journal in ISI's nutrition and dietetics category and publishes the latest worldwide basic and clinical studies relevant to human nutrition in topics such as obesity, vitamins and minerals, nutrition and disease, and energy metabolism. The AJCN was selected by the Special Libraries Association (SLA) as one of the top 100 most influential journals in Biology and Medicine over the last 100 years. Its 2013 Impact Factor is 6.918 according to Thompson Reuters.
Periodically, supplements to the AJCN are published, and these contain proceedings from internationally recognized conferences on clinical nutrition. Supplements are included in the subscription rate and are also available for purchase individually.
Guidelines and Policies
From here.
British Journal of Nutrition is a leading international, peer-reviewed journal of nutritional science. Established by the Nutrition Society in 1947, it has an international Editorial Board with a central Editorial Office in London.
BJN encompasses the full spectrum of nutritional science – epidemiology, dietary surveys, nutritional requirements and behaviour, metabolic studies, body composition, energetics, appetite, obesity, ageing, endocrinology, immunology, neuroscience, microbiology, genetics and molecular and cell biology. Submissions addressing the new frontiers of the subject, including the rapidly emerging area of nutritional genomics, are especially encouraged.