A study at Lund University in Sweden asked 29 patients to follow either a Paleolithic-style diet, which includes lean meat, fish, fruts, vegetables, eggs and nuts--but no grain products, OR a Mediterranean diet which includes whole grain breads. By the end of the 12-week study, people eating a Paleo diet had an average
26 percent decrease in blood sugar, while those eating the Mediterranean diet had only a 7 percent decrease. Also, the Paleo diet eaters had an average 2.2 percent decrease in waist circumference compared with 1.1 percent in the Mediterranean group, and the Paleo eaters had lower insulin levels. Both diets avoided dairy products, refined fat, sugar and salt.