Crafting a powder-based drink that can replace your entire diet, it turns out, is pretty darn difficult. Following a total recall of its food bars, Soylent has slammed the brakes on its flagship powder product too. The company says "a handful" of customers, or less than 0.1 percent, have experienced "stomach-related symptoms" similar to the ones reported by its snack bar users. (Those, if you need a reminder, include vomiting, diarrhoea and severe stomach pain.) Soylent is still looking for the root of the problem. Its previous powder formula, 1.5, appeared to be fine, so the company is narrowing its search to the ingredients specific to 1.6 and the bars.