Bitter Melon

Appearance

This herbaceous, tendril-bearing vine grows up to 5 m in length. It bears simple, alternate leaves 4–12 cm across, with three to seven deeply separated lobes. Each plant bears separate yellow male and female flowers. In the Northern Hemisphere, flowering occurs during June to July and fruiting during September to November.

The fruit has a distinct warty exterior and an oblong shape. It is hollow in cross-section, with a relatively thin layer of flesh surrounding a central seed cavity filled with large, flat seeds and pith. The fruit is most often eaten green, or as it is beginning to turn yellow. At this stage, the fruit's flesh is crunchy and watery in texture, similar to cucumber, chayote or green bell pepper, but bitter. The skin is tender and edible. Seeds and pith appear white in unripe fruits; they are not intensely bitter and can be removed before cooking.

Some sources claim the flesh becomes somewhat tougher and more bitter with age, but other sources claim that at least for the common Chinese variety the skin does not change and bitterness decreases with age. The Chinese variety are best harvested light green possibly with a slight yellow tinge or just before. The pith becomes sweet and intensely red; it can be eaten uncooked in this state, and is a popular ingredient in some Southeast Asian salads.

When the fruit is fully ripe, it turns orange and soft, and splits into segments which curl back to expose seeds covered in bright red pulp.

Naming

Bitter melon has many names in other languages, which have sometimes entered English as loanwords. Following are a few:

Uses

Bitter gourd podsboiled, drained, no saltNutritional value per 100 g Energy79 kJ Carbohydrates4.32 gSugars1.95 gDietary fiber2 g
Fat0.18 g
Protein0.84 g
Bitter melon has been used in various Asian and African herbal medicine systems for a long time. In Turkey, it has been used as a folk remedy for a variety of ailments, particularly stomach complaints. In traditional medicine of India, different parts of the plant are used as claimed treatments for diabetes, and as a stomachic, laxative, antibilious, emetic, anthelmintic agent, for the treatment of cough, respiratory diseases, skin diseases, wounds, ulcer, gout, and rheumatism.

"Momordica charantia" has a number of purported uses including cancer prevention, treatment of diabetes, fever, HIV and AIDS, and infections. While it has shown some potential clinical activity in laboratory experiments, "further studies are required to recommend its use". In 2012, the germplasm and chemical constituents, such as momordicin within several varieties of the gourd, were being studied.

For fever reduction and relief of menstrual problems, there is no scientific research to back these claims. For cancer prevention, HIV and AIDS, and treatment of infections, there is preliminary laboratory research, but no clinical studies in humans showing a benefit.

With regard to the use of "Momordica charantia" for diabetes, several animal studies and small-scale human studies have demonstrated a hypoglycemic effect of concentrated bitter melon extracts. In addition, a 2014 review shows evidence that "Momordica charantia", when consumed in raw or juice form, can be efficacious in lowering blood glucose levels. However, multiple reviews have found that "Momordica charantia" does not significantly decrease fasting blood glucose levels or A1c, indicators of blood glucose control, when taken in capsule or tablet form. "Momordica charantia" may be beneficial in diabetes; however, the effects seem to depend on how it is consumed. More studies need to be performed in order to verify this effect. The Memorial Sloan Kettering Cancer Center concludes that bitter melon "cannot be recommended as a replacement therapy for insulin or hypoglycemic drugs".

In Jamaica, tea brewed from cerasee leaves is a popular remedy for stomach and abdominal ailments. The plant grows wild in many areas, and the tea is made with freshly gathered leaves. The dried leaves in tea bags are also sold commercially and readily available for sale in stores.