Key Points:

A Massey University scientist is testing the theory that dairy protein is more filling than carbohydrates and fats, and could be beneficial for people trying to lose weight.

PhD student Sylvia Chung wants 50 volunteers to drink special milkshakes as part of her research on satiety -- the feeling of fullness after eating.

The popularity of high-protein diets has sparked public interest in the relationship between protein and weight loss, Ms Chung said.

"Dairy product consumption has been associated with the maintenance of healthy body weight in humans," she added.

Based at Massey's Palmerston North campus, Ms Chung will be examining the effects of whey protein, which occurs naturally in milk, and a popular dietary protein supplement, on fullness and weight management.

Volunteers - who must be from Palmerston North - will be asked to drink a milkshake before lunch on four different days, and then answer questions about how full they feel.