Samoan Ethnobotany: Underutilized Crops for Health

Samoan ethnobotany offers a fascinating look into the traditional uses of plants, particularly underutilized crops that hold significant potential for health and nutrition. This article explores how these indigenous plants can address modern health challenges, drawing insights from a comprehensive Samoa case study.

Samoan Ethnobotany: Underutilized Crops for Health and Nutrition

The Independent State of Samoa, with its capital Apia, is home to a rich Polynesian culture where traditional knowledge of plants has been passed down through generations. The country covers an area of 2,831 km² and has a population of approximately 194,320, primarily Samoans. Despite its rich natural heritage, Samoa faces increasing health challenges.

The Health Challenge: A Shift in Diet and Lifestyle

Samoa, like many nations, has seen a significant shift in diet and lifestyle over recent decades. This change has led to a worrying rise in obesity, with prevalence rates among adults exceeding 70% in some years (e.g., 2017). This increase is directly linked to the consumption of higher-energy diets and less active lifestyles.

Obesity-related diseases are a growing concern. Addressing this requires a multi-faceted approach, emphasizing:

• An active lifestyle and regular physical activity.
• A lower-energy and healthier diet, rich in specific micronutrients.

Essential Micronutrients for Health and Metabolism

Research highlights several key micronutrients vital for maintaining health and combating obesity. Many of these can be found in nutrient-dense, underutilized crops:

• Zinc: Reduces leptin deficiency, regulating appetite.
• Asparagine: Increases insulin sensitivity, promoting energy storage in muscle over fat.
• Biotin: Boosts metabolism, improves glycemic control, and lowers insulin.
• Carnitine: Carries fatty acids for fuel, reducing visceral adiposity (belly fat).
• Calcium: Inhibits fat cell formation and promotes fat oxidation.
• Lipoic Acid: Improves glucose uptake, enhancing carbohydrate burning.
• Vitamin K: Linked to sugar metabolism; poor status associated with excess fat tissue.
• Vitamin D: Deficiency linked to poor carbohydrate metabolism and fat cell formation.
• Vitamin E: Inhibits pre-fat cells from maturing, reducing body fat.
• Vitamin A: Enhances genes that reduce fat storage and shrinks fat cell size.
• Vitamin B3 (Niacin): Increases adiponectin (a weight-loss hormone) and can reduce body weight.
• Vitamin B5: Lowers body weight by activating lipoprotein lipase (fat-burning enzyme).
• Magnesium: Correcting deficiency stimulates metabolism by increasing insulin sensitivity and may inhibit fat absorption.
• Inositol & Vitamin B2: May increase adiponectin levels and reduce obesity risk.
• Cysteine: Supplementation has reduced body fat in obese patients.
• Glutamine: Reduces fat mass by improving glucose uptake into muscle.

Underutilized Samoan Crops: Nutritional Powerhouses

Samoan markets, like those inventoried in 2014, showcase a variety of local plants. Field research conducted in 2015 also identified many underutilized and wild edible plants. These