From this NYT article, The Claim: Lack of Sleep Increases Weight:
When the body is confronted with demands beyond what it is used to handling it makes an adaptation. It is the body’s form of self-protection, and it only occurs if you have enough rest. 
From this Science News article, High-Intensity Interval Training Is Time-Efficient and Effective, Study Suggests:
From this BBC article 'Good fat' cuts heart risk by a fifth, study shows:
Experts said cutting down on saturated fats, found in butter and meat, was just one part of a healthy diet. It is recommended that adults get no more than 11% of their energy from saturated fats. This is because the fats raise the levels of bad cholesterol that block the arteries to the heart. In comparison, polyunsaturated fats have the opposite effect by increasing the levels of good cholesterol.
From this article, High vitamin D levels, lower colon cancer risk? :
"Higher levels of vitamin D in the blood may help protect both men and women from cancers of the colon and rectum, confirm results of the largest study ever conducted on the topic.
