Homo sapiens brain size is 20% less than it was 29,000 years ago. IQ is also falling 7% a generation. Mental illness is on the increase. Why?   Why are our brains shrinking?   Today’s guest is Professor Michael Crawford. He discovered that brains are made out of omega-3 DHA in the 1970s. He is the Director of the Institute of Brain Chemistry and Human Nutrition.   At Chelsea & Westminster he has shown that pregnant women lacking omega-3 make a ‘filler fat’ called oleic acid, blood levels of which predict brain developmental and cognitive problems in their babies. His new book The Shrinking Brain explains why humanity is devolving, with dire consequences, unless we take action now to put nutrition and brain health at the top of the agenda.   Find out more about brain health on my website.