Lesser Yam

The Lesser Yam (Dioscorea esculenta), also known as “Lesser yam” or “Small yam”, is an edible tuber plant from the Dioscoreaceae family. It originally comes from Southeast Asia and is now widespread in tropical and subtropical regions, including India, Indonesia, the Philippines, and parts of the Pacific. It is characterized by its relatively small, roundish tubers with a thin, brown skin and firm, white to yellowish flesh.

The Lesser Yam is an important food plant in many rural regions, as it reliably produces yields even under difficult growing conditions. It grows well on poor soils, is resistant to some plant diseases, and can be stored for a long time. In addition to its culinary value, it also has medicinal significance in various cultures and is used in traditional healing for a variety of ailments.

What benefits does the Lesser Yam offer for health?

The Lesser Yam is rich in complex carbohydrates, fiber, minerals, and secondary plant compounds that are valued in naturopathy. The available research is not very conclusive when it comes to individual varieties of yams. Many studies examine the entire family of yam plants, which makes it difficult to draw conclusions about individual members of the family. More research will be necessary in the future to fully understand the effects. So far, the studies suggest the following effects:

  • Muscle growth and strength: Studies suggest that taking Dioscorea esculenta in combination with resistance training can increase levels of androgen hormones (such as DHEA and testosterone) and contribute to muscle hypertrophy and strength (1).
  • Anti-inflammatory properties: The compounds contained in Dioscorea have been shown to have anti-inflammatory effects, which is beneficial in inflammatory conditions and, due to the allantoin it contains, can also support wound healing (2,3).
  • Antioxidant properties: Results of scientific investigations link active compounds of the Lesser Yam to an antioxidant effect (2,4).
  • Blood sugar stabilizing: The slow release of carbohydrates can help keep blood sugar levels stable and reduce cravings (2,5).

How does the Lesser Yam work in the body?

The health effects of the Lesser Yam are based above all on the combination of slowly digestible carbohydrates, fiber, and antioxidant plant compounds. These constituents bring a range of different effects for the human organism. Traditional medicine also describes a tonic effect that is said to generally increase energy levels.

Are there any risks or side effects?

  • Avoid raw consumption: Like many yam species, Dioscorea esculenta can contain small amounts of potentially irritating substances in its raw state; however, these are neutralized by cooking.
  • Allergic reactions: In rare cases, skin or gastrointestinal reactions may occur.
  • Limited research: Modern clinical investigations are rare, which is why most health-related statements are based on traditional experience and animal studies.

Conclusion

The Lesser Yam (Dioscorea esculenta) is not only a valuable food source but also a component of traditional healing arts in several Asian cultures. However, further scientific studies are required to understand its full potential and to use it medicinally.

Sources:

  1. Horii, N., Hasegawa, N., Fujie, S., Iemitsu, K., Uchida, M., Hamaoka, T., & Iemitsu, M. (2020). Effects of Dioscorea esculenta intake with resistance training on muscle hypertrophy and strength in sprint athletes. Journal of clinical biochemistry and nutrition, 67(3), 338–343. https://doi.org/10.3164/jcbn.19-124
  2. Silalahi, M. (2022). Dioscorea esculenta (Lour.) Burkill: Uses and bioactivity. International Journal of Biological and Pharmaceutical Sciences Archive, 3(2), 20–25. https://doi.org/10.53771/ijbpsa.2022.3.2.0037
  3. Olayemi JO, Ajaiyeoba EO. Anti-inflammatory studies of yam (Dioscorea esculenta) extract on wistar rats. African Journal of Biotechnology. 2017; 6(16): 1913-1916.
  4. Manickam M, Veerabahu MR. In vitro antioxidant studies of Dioscorea esculenta (Lour). Burkill. Asian Pacific Journal of Tropical Biomedicine. 2012; (23): 1620-1624
  5. Sato K, Fujita S, Iemitsu M. Dioscorea esculenta induced increase in muscle sex steroid hormones is associated with enhanced insulin sensitivity in a type 2 diabetes rat model. The Faseb Journal. 2017; 31(2): 793-801.