The present invention relates to a process for the preparation of TetraselmisThe present invention relates to a pharmaceutical composition or a food composition for preventing, treating or ameliorating obesity or diabetes, which comprises a fraction of the extract of the present invention as an active ingredient. The fraction of Tetraselmissuecica extract has excellent effect of inhibiting differentiation of adipocytes or promoting migration of glucose into cells, and thus can be usefully used as a composition for preventing or treating obesity or diabetes. In addition, since it is a substance liberated from microalgae, the side effect on the human body is extremely less than the chemical synthesis and is very safe, so that it can be safely applied to pharmaceutical and food compositions.
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