Diabetes, Obesity, and Heart Disease treated by Nutritional Therapies in China and Europe: 19th-20th Century

All I need is an introduction for a proposal that answers this research question. Research question: How was nutritional therapy used to treat diabetes, obesity, and heart disease in Chinese and European cultures in between the 19th-20th century? The introduction should include (significance/scholarship, scope – time and geography), Thanks for all the hard work.