According to the average size of watermelon, the weight of half a watermelon is about seven or eight kilograms, and the heat per kilogram of watermelon is equivalent to the heat of three or two bowls of rice, so the heat of half a watermelon is equivalent to the heat of five or six bowls of rice. It should be noted that ordinary people will not eat five or six bowls of rice in one breath, but it is entirely possible to eat half a catty of watermelon in one breath, so it is especially necessary to pay attention to the right amount when eating watermelon, otherwise it is very easy to get fat.

Watermelon (scientific name: watermelon? (Thunb。 )Matsum。 Et Nakai) annual vine; Stems and branches are stout with obvious edges. Tendrils stout, pubescent, petiole thick and densely pilose; The leaf blade is papery, triangular, oval in outline, white and green in color, with short bristles on both sides and heart-shaped at the base of the leaf blade. Monoecious. Both male and female flowers are solitary in leaf axils.

Male pedicels 3-4 cm long, densely yellow-brown villous; Calyx tube wide bell-shaped; Corolla yellowish; Stamens nearly free, filaments short, anthers folded. Female flowers: calyx and corolla are the same as male flowers; Ovary ovoid, stigma kidney-shaped. The fruit is large, nearly spherical or oval, fleshy, juicy, with smooth skin and various colors and patterns. Seeds are mostly oval, black and red, with smooth sides, obtuse base, usually slightly arched edges, and in summer.

There are many cultivated varieties in China, with different exocarp, pulp and seed shapes, among which Xinjiang, Lanzhou, Gansu, Dezhou, Shandong and Dongtai, Jiangsu are the most famous. Its original species may come from Africa, widely cultivated in tropical to temperate regions of the world, and then introduced to China.

Watermelon is a summer fruit with sweet flesh, which can relieve summer heat. Seeds contain oil and can be used as entertainment food; The pericarp is medicinal, and has the effects of clearing heat, diuresis and lowering blood pressure.