Low-carb and Paleo diets put to the test
Monday, December 30, 2019
From 'How not to Diet' by M. Greger:
"In a study out of MIT, researchers increased the carbohydrate intake of subjects by up to hundreds of grams a day, yet their insulin levels went down. How is that possible? The researchers (...) fed them whole plant foods (.....).
What if you put someone on a very-low-carb diet like an Atkins diet? Low carb advocates (...) assumed doing so would lower insulin levels. But what they found was that there is no significant drop in insulin levels on very-low-carb diets. Instead, there is a significant rise in bad LDL cholesterol levels .(...)
What about the paleo diet? The paleo diet movement gets a lot of things right. it tells people to ditch dairy and donuts, eat lots of fruit, nuts, and vegetables, and cut out a lot of processed junk. But a study published in The Internationl Journal of Exercise Science has raised concerns.
Researchers took young healthy people and put them on a paleo diet along wit a Cross-Fit based, high-intensity circuit training exercise program. If you lose enough weight by any means (...) you can temporarily drop your cholesterol levels no matter what you eat. After ten weeks of hard-core workouts and weight loss on the paleo diet, however, the study participants' LDL cholesterol STILL went up - and it was even worse for those who started out the healthiest. (...)... "the paleo diet's deleterious impact on blood lipids (fats) was not only significant, but substantial enough to counteract the.... improvements commonly seen with improved fitness and body composition." (...)
On the other hand, put people on a plant-based diet and a modest, mostly walking-based exercise program, and within three weeks, their bad cholesterol can drop 20 percent and their insulin levels can plummet 30 percent, despite a 75-80 percent carbohydrate diet. In contrast, the paleo diet appeared to have 'negated the positive effects of exercise." "