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There are differences between dark and milk chocolate, such as intensity of flavor and ingredients, which could influence eating behavior.
To find out if different kinds of chocolate had different effects on appetite and calorie consumption researchers conducted this small crossover study with 16 young men.
In random order the men ate 100 grams of either milk or dark chocolate. Appetite was measured before they ate the chocolate and at 30 minute intervals for the next five hours.
Two hours after they ate the chocolate the men were given a meal where they could eat as much as they wanted. After they ate the dark chocolate the men reported feeling fuller and less hungry.
Ratings on desire to eat something sweet, fatty, or savory were also lower after they ate dark chocolate.
The men ate 17% fewer calories during the test meal after they ate dark chocolate than when they ate milk chocolate.
Greater flavor intensity of dark could help explain the findings. So, too, could the difference in fat content between the two kinds of chocolate.
Dark chocolate contains cocoa butter only, while milk chocolate contains both cocoa butter and butter fat. If GI transit time of dark chocolate is longer because of the cocoa butter, this could lead to appetite suppression.