https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3587394/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3587394/ short, sharp bursts of exercise can have a positive affect https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3587394/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3587394/ this one review recent review https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3587394/ Diabetes, Metabolic Syndrome and Obesity recent review