Those who conducted the brief but intense examination of diet concluded that eating the very things that our primate cousins prefer is just as effective as modern drugs in lowering levels of the bad cholesterol, known as LDL. The ape diet, heavy in whole grains, nuts, soy and fruits and vegetables, is also cheaper than medicine, has fewer side effects and, if properly prepared, tastes a heck of a lot better.
—"WWKD?," Salt Lake Tribune, July 26, 2003

Participants who took a 20-milligram daily dose of lovastatin and ate a vegetarian diet saw their LDL cholesterol fall 30.9 per cent.

Those who followed the same diet, but didn't take the drug, had reductions of only 8 per cent.

Members of the third group, who ate the customized [ape] diet, saw their LDL levels fall 28.6 per cent in four weeks.
—Andre Picard, "'Ape' diet a cholesterol-buster, researcher says," The Globe and Mail, July 23, 2003

Participants followed three evolutionary diets, each one for two weeks at a time. The oldest, the Great Ape Diet, consisted of fruits, vegetables, leafy greens and nuts, but no starch or animal foods. Volunteers munched their way through five kilograms of produce each day, taking in more than 100 grams of fibre, plenty of vegetable protein, little fat and virtually no cholesterol. ...

To Jenkins' surprise, after one week on the Great Ape Diet, participants' LDL (bad) cholesterol levels dropped by 33 per cent, the same magnitude you'd see with cholesterol lowering drugs called statins. The Stone Age diet was about two-thirds as good, while the modern diet had only a modest effect on blood cholesterol.

Jenkins attributes these heart-healthy effects to three key ingredients — soluble fibre, vegetable protein, and naturally occurring compounds called plant sterols — all abundant in the ape diet.
—Leslie Beck, "Eat like the apes, researcher suggests," The Toronto Star, May 7, 2001