From protein substitutes to sustainable nutrition: rethinking plant proteins

As the world marks World Vegetarian Day on October 1, the conversation around vegetarianism is increasingly moving beyond individual food choices. The day, established by the North American Vegetarian Society in 1977, draws attention to the health, environmental and ethical dimensions of vegetarian diets and marks the beginning of Vegetarian Awareness Month. But its significance today extends to a much larger question: how can food systems provide adequate nutrition while remaining affordable, environmentally sustainable and resilient?

For India, this question is particularly important. Protein is frequently discussed as a nutrient gap, but the challenge is not simply to consume more protein. It is to improve protein quality, dietary diversity, affordability and access, while ensuring that protein-rich foods remain compatible with India's ecological and cultural realities.

This requires looking beyond the conventional binary of meat versus vegetarianism. Plant proteins like pulses, beans, peas, soy, nuts, seeds and other protein-rich crops can form an important part of a diversified food system, provided that their availability, quality and consumption are strengthened.

From protein quantity to protein quality

Protein is essential for growth, tissue repair, immune function, muscle maintenance and metabolic health. Yet the nutritional value of a diet cannot be assessed by protein quantity alone. Amino-acid composition, digestibility, dietary diversity and the overall nutrient profile of foods also matter.

India's dietary pattern has historically relied heavily on cereals. While cereals provide energy and some protein, combining them with pulses and other protein-rich foods can improve the overall quality of the diet. The ICMR-NIN Dietary Guidelines for Indians 2024 specifically emphasise dietary diversity and recommend combining cereals or millets with adequate pulses or beans. The guidelines note that a cereal-pulse combination can improve protein quality and that vegetarians can meet their protein and essential amino-acid requirements through an appropriately planned diet that includes pulses, beans, peas and dairy. A sustainable protein transition does not mean replacing one food with another indiscriminately. It means building diverse meals in which complementary foods work together to improve nutritional quality.

Plant protein is also a food-systems question

The environmental case for greater reliance on plant-based foods is increasingly clear, although the sustainability of any food depends on how and where it is produced, processed and consumed. The World Health Organization notes that healthy diets rich in whole grains, vegetables, fruits, legumes and nuts are associated with lower environmental impacts, including greenhouse gas emissions and land and water use.

My earlier analysis on plant-based alternatives highlighted the potential of reducing reliance on conventional meat through plant-centred alternatives. Life-cycle assessments generally indicate that many plant-based meat alternatives have lower environmental impacts than comparable animal-based products, particularly for greenhouse-gas emissions and land use, although results vary by product, comparator and production system.

The environmental advantage of plant-based alternatives, however, should not be confused with nutritional or sustainability equivalence across all products. Healthy plant-based diets are generally characterised by foods such as whole grains, vegetables, fruits, legumes, nuts and seeds, whereas a plant-based diet can also include refined grains, sugar-sweetened beverages, snacks and ultra-processed meat and dairy substitutes. A meal centred on pulses, vegetables, whole grains, nuts and minimally processed soy is therefore nutritionally different from one dominated by highly processed products simply because their ingredients are plant-derived.

Therefore, India's sustainable protein conversation should not become synonymous with the rapidly expanding market for plant-based meat analogues. These products can have a role, particularly in enabling dietary transitions among consumers accustomed to meat, but they should complement and not displace the much broader ecosystem of affordable, minimally processed plant foods.

India's protein opportunity lies in its diversity

India's food system has considerable untapped potential in pulses, legumes, oilseeds, soy and underutilised protein-rich crops. Recent research on underutilised high-protein crops in India identifies 28 such crops and highlights their potential to improve dietary quality, climate resilience and livelihood diversification, while noting that their integration into mainstream food systems remains limited. The challenge, therefore, is not simply identifying protein-rich crops, but creating the conditions for them to move from local production and traditional food cultures into viable markets and everyday diets.

Pulses provide an important example by contributing protein and micronutrients while also offering agronomic benefits through biological nitrogen fixation and their role in diversified cropping systems. Yet India continues to face challenges in ensuring adequate and affordable pulse availability. Recent data also illustrate India's continuing dependence on imports to supplement domestic pulse supply, with imports responding to fluctuations in domestic production and demand. This matters for dietary diversity: the affordability of nutritious diets remains an important constraint, and the cost of healthy diets can limit access to diverse, nutrient-dense foods.

A sustainable protein strategy should therefore connect farm production with consumer nutrition. Public procurement and food-based safety nets can create demand for diverse, locally produced foods, while school meals provide an important platform for improving dietary diversity. FAO's work on sustainable public food procurement highlights how institutional demand can connect local farmers and food enterprises with nutrition objectives.

India already has platforms through which such linkages can be strengthened. Under PM POSHAN, meals include pulses and vegetables within prescribed food norms, while states and Union Territories are encouraged to tailor menus to local conditions and procure locally grown foods such as millets and vegetables. Such approaches create an opportunity for nutrition policy to support agricultural diversification by linking institutional food demand with locally produced, diverse protein sources.

From protein gap to sustainable nutrition transition

India's nutrition challenge is increasingly defined by a double burden: persistent undernutrition alongside rising overweight, obesity and diet-related non-communicable diseases. Evidence from India documents the coexistence of undernutrition and overnutrition across population groups, including among women of reproductive age. In such a context, addressing individual nutrient gaps alone is insufficient. What matters is the quality and diversity of the overall diet. Plant proteins can be part of that transition, but only when embedded within healthy and diverse dietary patterns.

The opportunity is therefore to reconnect India's traditional food knowledge with modern nutrition science and sustainable agriculture. For India, the future of protein security may lie less in asking how much protein do we need? and more in asking where our protein comes from, who can afford it, how it is produced, and whether the overall diet is nourishing and sustainable. That is the shift, from protein sufficiency to nutritional security, and from individual dietary choices to food system transformation that World Vegetarian Day can help bring into focus.

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