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There are also trends in how to lose weight, but these days there are many ways to reduce carbs and increase fat intake. But such a diet product is selling products such as coffee with butter, but the effect is often exaggerated.

I am Nam Joo-hyun.

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These days, it is a 'bulletproof coffee' that is sold a lot in marts and coffee shops.

If you drink it with unsalted butter or oiled coffee, you can get energy that is strong enough to stop bullets.

Low-carb high-fat, so-called 'low-tango high' diet products are overflowing with advertising.

But some are advertising the effect of diet.

The KFDA uncovered 373 sites selling bulletproof coffee with a diet that lost weight and a sustainable diet even though it was not a dietary supplement.

[Kim, Myung-Ho / Director, Cyber ​​Research Group: This is an example of the functional content of health functional food in that it helps to suppress appetite without eating (if you drink bulletproof coffee).]

Don't be blind for the "Low-Tangoji" diet.

Although you may temporarily feel full and suppress your appetite, eating too much saturated fat can raise your cholesterol levels, leading to atherosclerosis and cardiovascular disease.

[Kang Jae-heon / Gangbuk Samsung Hospital, Department of Family Medicine: Egg yolks and foods have some restrictions on intake than before, but they still recommend medically that they should not exceed appropriate levels.]

A balanced diet is recommended instead of a 'one food' diet with many side effects.

(Video coverage: Park Jin Ho, Video editing: So Young Lee)