In the 1970's, at the University of Ohio, a study on diet-related blocked arteries in heart disease was conducted. Rabbits were fed with quite toxic, high-cholesterol diet which would block their arteries.
Consistent results were obtained across all rabbit groups except for one which showed a remarkable 60% less symptoms. Nothing in the rabbit's physiology could account for thier remarkable tolerance to the diet. Then by accident, it was discovered that the student who fed them liked to pet and fondle them. He would hold the rabbits lovingly before feeding them. Astonishingly, this factor alone seemed to account for the group's strong immunity.
Additional studies were later conducted which included neutral groups of rabbits and one group that was touched and loved. Again, increased immunity was displayed in the latter group.