The present invention relates to extracts of deoiled seeds which are useful for the prevention and treatment of dyslipidaemia , hyperglycaemia and hypertension , metabolic syndrome and type 2 diabetes. The present invention also relates to the process for preparation of said extracts and compositions containing them. The extracts according to the invention when added to carbohydrate- based foods ,reduce the glycaemic index and postprandial absorption of glucose , and induce a modification of the lipid profile.