How has the nutritional quality of our fruits and vegetables decreased?
Several studies have shown a significant drop in the levels of vitamins and minerals in today’s fruits and vegetables compared to those grown a few decades ago.
Two examples that really stood out to us:
- Tomatoes: In the past 60 years, the vitamin C content in tomatoes has dropped by 59%¹.
- Spinach: Analysis reveals a 96% reduction in copper and a 60% reduction in iron².
- The nutritional value of many popular vegetables has dropped since 1950. A 2004 American study found that key nutrients in some crops are up to 38% lower than they were in the mid-20th century⁵.

What’s behind this decline?
Several factors contribute to the loss in nutritional quality:
- Harvest and transport practices: Fruits and vegetables are often picked before they’re fully ripe to survive transportation and last longer on shelves. But early harvesting limits their nutritional development.
- Soil depletion: Overuse of farmland drains the soil of essential minerals, directly affecting the nutrient quality of crops. Just like our gut needs a variety of microbes to stay healthy, soil also needs diverse microorganisms to nourish plants. Overexploited land loses these vital microbes, making the soil less fertile and crops less nutritious. Once you focus on soil health, plant health naturally improves⁷.
- Selective breeding: Choosing crop varieties based on appearance or resistance often comes at the cost of genetic and nutritional diversity.
- Genetic modification: While GMOs can increase yields and pest resistance, they can also unintentionally reduce nutrient content in crops.
- Climate change: Shifting climate conditions affect plant growth and can alter nutrient profiles. For example, higher CO₂ levels may increase carbohydrate content but reduce essential minerals like zinc and iron.

Why this matters for our health
This drop in nutritional density has real health consequences:
• Nutrient deficiencies: Eating foods that are consistently lower in nutrients can lead to vitamin and mineral deficiencies.
• Chronic disease risk: A less nutritious diet can increase the risk of obesity, diabetes, and heart disease³.
There are still many unknowns in how agriculture and nutrition interact — but here’s what we do know: more than 2 billion people suffer from micronutrient deficiencies globally. Tracking the nutrients could unlock massive public health benefits⁶.