In a month characterised by a resolve to renew our lives, our usual plan is to switch to a lighter diet or to take more exercise. This January, however, there’s a new eating phenomenon offering an even greater test of will. It is called “Veganuary”, one month of eating only plant-based foods – no meat, fish or dairy. Over 50,000 people in the UK have made the pledge to Veganuary, say its activists. Pledgees are promised many benefits: for the planet, for animals, and for their own health.Christmas.