The nutrition content of processed food has changed over time. The good news is that: Newer products often have less sugar, less salt, and more fibre. But that's offset by a change in fat content: New cereals, yogurts, and snacks tended to be higher in fat.

While there are many quick breakfasts - buttered toast, granola bar, banana - cereal reigns supreme. But a new contender has climbed the ranks: Soylent, the nutrient slurry marketed to busy Millennials. Both are convenient, but neither is very natural. Which is a better option on a rushed morning?