Yacon is a herbaceous composite plant cultivated for its crisp, sweet, tuberous roots, which resemble small sweet potatoes in shape but taste like a cross between apple and watermelon pear, with carbohydrates stored predominantly as fructooligosaccharides rather than starch.
History & Origins
Yacon was domesticated in the central Andes in pre-Columbian times, with archaeological evidence of its cultivation exceeding 1,500 years, and it was grown alongside potatoes, oca, and ulluco by Inca and pre-Inca farmers for both food and medicinal use. Spanish chroniclers documented the root in the 16th century, but it never spread as widely as the potato and remained a regional crop until the late 20th century. Since the 1990s yacon has attracted international interest as a functional, low-calorie sweetener after Japanese and Brazilian researchers highlighted its high fructooligosaccharide content.
Nutrition Facts
Per 100 g, edible portion (estimated)
- 38 kcalCalories
- 0.5 gProtein
- 0.1 gFat
- 9.5 gCarbs
- 3.0 gFiber
- 4.0 gSugars
- 150 mgPotassium
- 6 mgVitamin C
- 0 mcgVitamin A
Culinary Uses
- Eaten raw, peeled and sliced, in fruit salads or with lime juice
- Blended into juices, smoothies, and the reduced yacon syrup used as a sweetener
- Stir-fried or roasted in Andean pachamanca-style pit cooking
- Pickled in vinegar or fermented into traditional chicha-style beverages
- Dehydrated and ground into powder for teas, desserts, and bakery fillings
Known Benefits
- High in fructooligosaccharides (FOS) that act as prebiotics, feeding beneficial Bifidobacteria in the colon
- Very low in digestible sugars and calories, suitable for diabetic and weight-loss diets
- Provides potassium and trace antioxidants such as chlorogenic and caffeic acids
- Mild laxative effect that supports regularity without harsh stimulant action
Hidden Benefits
- FOS enhance calcium and magnesium absorption in the large intestine, supporting bone density
- Phenolic compounds in the peel and flesh show in-vitro inhibition of α-glucosidase, moderating post-meal glucose
- Associated in small human trials with improved satiety hormone response and modest reductions in fasting insulin
- Root flesh contains selenium-binding proteins that may support thyroid function
Cautions & Considerations
- Excess raw consumption can cause flatulence, bloating, and loose stools due to rapid fermentation of FOS
- Tubers oxidize and turn brown quickly after peeling, so should be briefly immersed in acidulated water
- Leaves and stems contain ent-kaurene diterpenes with reported hypoglycemic activity that can interact with diabetes medication
- Rare allergic reactions (oral itching) have been reported in sensitive individuals, especially those allergic to Asteraceae pollen
