A sterilised food product containing starch, the starch having: (a) an amylose content of at least 60 wt. %; (b) a median particle size of between 1 and 15 &mgr;m, at least 90 wt. % of the starch particles having a particle diameter of less than 50 &mgr;m; and (c) a non-digestible starch content of less than 50 wt. %; and (d) a slowly digestible starch content of 15-75 wt. %. The product is obtained by heating and rapidly cooling the starch product and has a high slowly digestible starch content. It is suitable for use in the treatment of diabetes, obesitas, insulin resistance, or for postprandial glucose response.