Left: In Germany potatoes are grown as food since 1647.
100 years ago potatoes were the only food for many months of the year. Lack of potatoes resulted in hunger and starvation of many people.
The main nutrient in potatoes is starch.
* Bite off small pieces of a fresh potato and chew them very carefully for  two minutes.
* Do not swallow the pulp but spit it into an infusion bottle.
* Always collect saliva with remaining potato and add it to the bottle before continuing the procedure.
* Observation right: A white layer of starch can be seen on the bottom of thebottle.