The next experiment investigated the correlation between a high calcium diet and losing fat.
Volunteers spent one week on a diet high in dairy-based calcium—milk, cheese and yogurt. The next week they ate a diet low in dairy and calcium. Both diets contained exactly the same amount of calories and fat.
They also collected their stool samples and sent them off to a lab where scientists analyzed how much fat their bodies were absorbing and how much was passing through—a complicated process that took three months to finish.