Isoenergetic 1000 kJ (240 kcal) servings of 38 foods separated into six food categories (fruits, bakery products, snack foods, carbohydrate-rich foods, protein-rich foods, breakfast cereals) were fed to groups of 11-13 subjects. Satiety ratings were obtained every 15 min over 120 min after which subjects were free to eat ad libitum from a standard range of foods and drinks.
A satiety index (SI) score was calculated by dividing the area under the satiety response curve (AUC) for the test food by the group mean satiety AUC for white bread and multiplying by 100.
Thus, white bread had an SI score of 100% and the SI scores of the other foods were expressed as a percentage of white bread.
The results were:
There were significant differences in satiety both within and between the six food categories. The highest SI score was produced by boiled potatoes (323 +/- 51%) which was seven-fold higher than the lowest SI score of the croissant (47 +/- 17%).
Most foods (76%) had an SI score greater than or equal to white bread.
The amount of energy eaten immediately after 120 min correlated negatively with the mean satiety AUC responses (r = -0.37, P < 0.05, n = 43) thereby supporting the subjective satiety ratings. SI scores correlated positively with the serving weight of the foods (r = 0.66, P < 0.001, n = 38) and negatively with palatability ratings (r = -0.64, P < 0.001, n = 38).
Protein, fibre, and water contents of the test foods correlated positively with SI scores (r = 0.37, P < 0.05, n = 38; r = 0.46, P < 0.01; and r = 0.64, P < 0.001; respectively) whereas fat content was negatively associated (r = -0.43, P < 0.01).
This goes a long way to explain the Kitavan diet which is largely sweet potatoes. Can you imagine eating sweet potatoes every day as a main staple? Even though they are high carbohydrates it would be tough to over eat them.
Added: Gary Taubes takes on the palatable foods cause obesity theory (CATCHING UP ON LOST TIME – THE ANCESTRAL HEALTH SYMPOSIUM, FOOD REWARD, PALATABILITY, INSULIN SIGNALING AND CARBOHYDRATES… PART II(E, AS IN “END” AND “ENOUGH ALREADY”). Gary has some good points about the usefulness of this idea.