Scientists at Exeter University are to investigate nutrigenomic diets ? which are offered on the internet as personalised eating plans, and on the supposed principle that eating habits should be based on genetic factors. The study, led by Dr Paula Saukko, of the Economic and Social Research Council (ESRC) Centre of Genomics in Society, is funded by the Wellcome Trust, and is the first to look at the claims that diets can be based on DNA.