The current diet of most of our planet's human inhabitants is contributing to world hunger. The good news is that multiple scientific studies have shown that each of us can contribute to solving this devastating problem. Here is a sampling of these studies.
One studyfound that currently, 36% of the calories produced by the world’s crops are being used for animal feed, and only 12% of those feed calories ultimately contribute to the human diet. Growing food exclusively for direct human consumption could, in principle, increase available food calories by as much as 70%, which could feed an additional 4 billion people (more than the projected 2–3 billion people arriving through population growth).
Another study concluded that shifting 16 major crops to 100% human food could add over a billion metric tons to global food production (a 28% increase), or the equivalent of a 49% increase in kilocalories.
A quantitative analysis of global and regional food supply concluded that the current production of crops is sufficient to provide enough food for the projected global population of 9.7 billion in 2050, but that this would require radical changes to the dietary choices of most, including replacing most meat and dairy with plant-based alternatives.
Yet another study concludes that plant-based replacements for each of the major animal categories in the United States (beef, pork, dairy, poultry, and eggs) can produce 2-fold to 20-fold more nutritionally similar food per unit cropland. Replacing all animal-based items with plant-based replacement diets can add enough food to feed 350 million additional people.