Lancet study: Fortified foods close 7 bn nutrient gaps, impact can triple

Fortification is one of the most cost-effective nutrition tools, preventing billions of deficiencies each year, while still holding massive untapped potential

A major new study published in The Lancet Global Health revealed that large-scale food fortification currently prevents nearly 7 billion nutrient gaps every year. However, researchers say this is only the beginning. According to the report led by the Global Alliance for Improved Nutrition (GAIN), a strategic expansion of these programs could triple that impact, potentially closing 25 billion gaps in vitamin and mineral deficiencies worldwide.

 

“Our study shows that large-scale food fortification is a cost-effective intervention for preventing inadequate micronutrient intakes,” said co-lead author Christopher Free, research professor at UC Santa Barbara. “And expanding food fortification to include more countries and foods could prevent billions more at low additional costs.”

 

 

What is food fortification and why it matters

 

Food fortification involves adding key micronutrients such as iron, iodine, vitamin A, and folic acid to commonly consumed foods like flour, rice, oil, and salt. These nutrients are critical for immunity, growth, and brain development, but many diets globally fall short.

 

Micronutrient deficiencies affect billions and are linked to poor health outcomes, lower productivity, and impaired cognitive development. Fortification helps battle these deficiencies because it does not require people to change what they eat, instead, it improves the nutritional value of foods at low cost. This makes it particularly valuable in low- and middle-income countries where access to diverse, nutrient-rich diets remains limited. 

 

What the study found

 

The research, titled 'Impact of large-scale food fortification programmes on micronutrient inadequacies and their implementation costs: a modelling analysis,' offers the first comprehensive global analysis of both the cost and impact of large-scale fortification programmes. The study was led by researchers at GAIN, in collaboration with the University of California, the World Bank, and Tufts University, and it modelled the impact of fortification across 185 countries, covering 99.3 per cent of the global population.

 

The study found that current programmes prevent around 7 billion nutrient gaps annually. This is achieved at a cost of just $0.18 (about ₹15-16) per person per year. Researchers highlight that iodised salt and iron-fortified flour account for a significant share of the current impact.

 

"Salt iodization alone prevents 3.3 billion iodine deficiencies each year—reducing global iodine deficiency by 87 per cent," said Dr Mduduzi Mbuya, co-author of the study and Director of Knowledge Leadership at GAIN.

 

The study estimates that every dollar invested in fortification yields approximately $27 (around ₹2,500) in returns, driven by improved health outcomes and increased productivity.

 

Despite existing fortification efforts, an estimated 38.6 billion nutrient gaps persist globally, driven by poor diet quality, limited programme coverage, and weak compliance with fortification standards. These deficiencies affect 1 in 2 preschool-aged children and 2 in 3 women of reproductive age globally.

 

Even under a best-case scenario with optimised fortification programmes, an estimated 20.9 billion nutrient gaps would still persist, underscoring the need for complementary strategies.

 

"Fortification is a powerful tool, but it is most effective as part of a comprehensive strategy," said Florencia Vasta, global lead for large-scale food fortification at GAIN.

“Achieving optimal nutrition for everyone will require parallel investments in dietary diversity, supplementation for vulnerable groups like pregnant women and young children and making healthy diets more affordable and accessible," she adds.

 

What needs to change

 

Researchers outline three key actions:

 

• Improve compliance - Many countries have fortification laws, but implementation is inconsistent. Raising compliance to 90 per cent could prevent additional 6.1 billion nutrient gaps for $0.23 (around ₹21) per person annually
• Align with global standards - Harmonising national policies with World Health Organization guidelines would prevent 10.3 billion additional nutrient gaps at $0.63 (around ₹60) per person
• Expand to high-need regions - Scaling programmes in countries with the highest burden of deficiencies would prevent 17.7 billion additional nutrient gaps at $1.15 (around ₹108) per person

 

Together, these steps could dramatically expand reach while still keeping costs relatively low.

 

Risk of excessive intake

 

While the benefits are substantial, the researchers caution that scaling up fortification must be done carefully. They stress the need to align programmes with World Health Organization (WHO) guidelines and strengthen monitoring systems, so that interventions remain tailored to each country’s nutritional needs and do not lead to excessive intake.

 

This concern is particularly relevant for nutrients such as iodine, selenium, and zinc, where overconsumption can pose health risks if not properly regulated.

 

The study notes that the modelled expansion of fortification could place over 15 per cent of the global population at risk of excessive intake of iodine and zinc. However, this risk is not uniform and varies widely across countries, depending on existing dietary intake levels and how programmes are designed.

 

Researchers add that there are significant country-specific differences in both the benefits of deficiency prevention and the risks of excess intake, underscoring the importance of targeted, well-regulated approaches.

 

What this means for public health

 

The findings reinforce food fortification as a cornerstone of global nutrition strategy, especially in regions where dietary improvements are harder to achieve quickly.

 

The study provides a clear roadmap for policymakers:

• Strengthen existing systems
• Expand coverage
• Ensure quality standards are met

 

If implemented effectively, these steps could significantly reduce the burden of hidden hunger, improve population health, and boost economic productivity, at a remarkably low cost.     

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This report is for informational purposes only and is not a substitute for professional medical advice.