A healthy diet is more than just calories. Priya Shetty gets the figures on the cost of poor nutrition — and the scale of the challenge.

GM crops were supposed to rescue the world's one billion undernourished people. Carol Campbell discusses whether they will ever curb hunger.

A peanut butter-like paste has been proposed to curb childhood malnutrition, but critics claim there is little evidence for its success.

Cassava is getting a transgenic makeover to boost its nutritional value, shelf-life and disease resistance.