I came across this long article ( http://www.menshealth.com/health/saturated-fat ) that reviews many studies done in the past on whether eating saturated fat is causing heart disease. The article is against the simple hypothesis created in the 60's that saturated fat is positively related to heart disease, and claims that eating a good amount (not overeating) of saturated fat doesn't necessarily cause you to gain weight and become risky of heart problem, while unhealthy living habit (exercise/smoking/driving etc.) along with high carbohydrate intake is what's causing the increase of heart attack in the US in recent decades.

I myself tend to agree with this article. I've always been a devoted fat/meat eater (I do avoid transfat though) since child age, and I have always been lean (130-140 pounds) until I got out of college and began working, my living habit changed dramatically (8 hour tiring brain work = no will for exercise; high stress causing me to eat a lot of junk food and sweetened soft drink), and I gained 20 pounds, but it's been steady since then (about 2 years now), after I cut down on junk food and sugar intake. I tend to feel that sugar is the biggest problem for American people's health. You know back then, sugar was a luxury and people didn't get to have it very much. Nowadays with cane sugar being more readily available and large production of corn syrup, Americans are feasting on sugar with an addiction, along with less physical activity (why do people rather wait 2 minutes for a parking space super close to the building than parking a little further away and walking for just 1 minute?), which is what I believe is what's causing the increase in heart disease.