For a growing number of consumers "grass-fed" is one of the strongest health and sustainability messages. So it's no surprise that demand for foods from grass-fed sources is growing steadily. In the US, for example, sales of grass-fed meat are three times those of the much-hyped plant-based substitutes and grew by 31% last year. And at least one former vegan ice cream brand is now thriving by offering grass-fed dairy ice cream. If you are thinking about the future of food, this development and what it says about humans is one you have to understand. Time: 25 minutes