Abstract: One or more embodiments of the present invention describe a novel use of capsanthin and/or fatty-acyl ester of capsanthin to inhibit both the differentiation of pre-adipocytes to adipocytes and the accumulation of fat in the adipocytes. One or more embodiments of the present invention are based on findings that capsanthin contained in some natural products such as red pepper, paprika, bell pepper, etc. have anti-adipogenic activity by inhibiting both the differentiation of pre-adipocyte into adipocyte and the accumulation of fat in adipocytes, Therefore, this findings provide a functional food and a pharmaceutical composition wherein capsanthins and the extract of any natural products containing the same components are included in the functional food and the pharmaceutical composition, to offer obesity prevention and/or treatment effects.