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Dietary intake of purple sweet potato powder affected bone mineral content of ovariectomized rats

Female SD rats (9 month old) were either ovariectomized or sham‐operated before they were randomly assigned into 6 treatment groups. Rats in group A were sham‐operated but those in other groups were all ovariectomized. Groups A and B were fed the AIN93M diet, but groups C, D and E were fed the AIN93M diet with 5%, 10% or 15% of the corn starch replaced by equal amounts of purple sweet potato powder, respectively. Stokes purple sweet potatoes were steam cooked at 200 F for 1 hr before the skin was removed, mashed, freeze‐dried and then ground into fine powder. Group A was fed ad lib, but the amounts of diets given to other groups were restricted to the average intake of Group A. The rats were fed their assigned diets for 6 weeks. The bone mineral content for group A was higher than for other groups but the group fed 10% purple sweet potato powder had bone mineral content similar to that of group A. Rats fed 15% purple sweet potato powder diet had diarrhea. These results indicate that purple sweet potato powder helped to prevent bone loss caused by ovariectomy. However, excessive consumption of purple sweet potato powder (15% of the diet) caused digestive disorders and was not protective against bone loss.