Year 2998. December 20. One thousand years ago, there was a big change in the world, called Euro, and most Europeans had a radical change in their daily lives (in year 2851, all the world agreed on Earth currency, but that is a different story).
Now, there is another big change: Compact Swallowable Food (Comswaf). The old-fashioned food will be replaced by Comswaf in January 1st, 2999. The food commercials of the past emphasized the experience while consuming the product. If pills are what we consume, then we just swallow them with water.
What features of Comswafs are promoted? Why would I pick McTrump's pills over Comswaf King's?
Mithrandir24601 also gave some background in his answer. Conversion to Euro is maybe not a very good metaphor, but the products were being promoted for a long time. They also come as different sizes and hardesses for toddlers. For babies, they can be crushed into powders and mixed with water to get a soft infant formula.
One should keep in mind that not everyone received this type of food very well. There are still communities who protest against compact food. However, there are so few places that you can actually find food (except if you produce your own fruits).
More on background
There was some debate on this matter a few hundreds of years before. Some thought it was impossible to let go of the old-fashioned food, and some others thought people would not even survive for one thousand years.
Please know your history well. After we colonized on mars in 2042, there was extremely limited oxygen on the red planet and in the night the temparature drops down to 218 Kelvin, it is really inconvenient to cook food there.
After a few decades, newborns in Mars were already adapted to the compact food (as powder form or syrup form). There were a compact food for every single need of human body. Since people never cooked in mars, there vere no ovens, no stoves, no equipment to cook.
In 2160, the first hotel in Mars was built. After four years, in 2164, the first holiday trip to Mars was available with ultra-high-speed transportation. People who went there for holiday found no food, but only pills. Randy Gamsay, had a brilliant idea to start a bussiness of compact food on Earth.
When you're travelling, buy your compact food from Earth! It is a lot cheaper!
The business caught on as more and more people gave up eating traditional food. By the year 2900, the currency on Earth is common, all cultures are mixed up, and resources are limited. After a serious meeting held by world leaders, the process of letting time-consuming, stinky, old-fashioned food go begun.
The taxes on food producers were tripled. The costs of starting a compact food business were halved.
And here we are, year 2999. Not a sudden change, but it happened. No more old-fashioned cooked food. There are still fruits, vegetables, and animals, though.