All about fruitarianism with a long-term fruitarian, Lena

Leaves and stems of plants, green vegetables or leafy greens, are widely consumed by humans. The protein contents are higher than in fruits, and they contain low amounts of sugar.

Some green vegetables produce secondary metabolites that have bitter or astringent properties and may produce toxic alkaloidal and other compounds such as hemoglutenens. Others produce intestinal enzyme inhibitors, such as lectins, which bind to mucosal surfaces and inhibit digestion, especially that of proteins. 

Plant secondary metabolism produces a large number of specialized compounds (~ 200.000) that do not aid in the growth and development of plants but are required for the plant to survive in its environment. Specialized compounds from secondary metabolism are essential for communicating with other organisms in mutualistic (e.g. attraction of beneficial organisms such as pollinators) or antagonistic interactions (e.g. deterrent against herbivores and pathogens). They further assist in coping with abiotic stress such as increased UV-radiation.

The broad functional spectrum of specialized metabolism is still not fully understood.

Well known specialized compounds include alkaloids, polyphenols including flavonoids, and terpenoids. Humans use quite a lot of these compounds, or the plants from which they originate, for medicinal and nutraceutical purposes.


Not everything that can be counted counts, and not everything that counts can be counted.

Amino Acids

Protein plays a crucial role in almost all biological processes and amino acids are the building blocks of it.

A large proportion of our cells, muscles and tissue is made up of amino acids - 20% Of the human body is made up of protein. 

~500 Amino acids are known, 20 appear in the genetic code, 9 are essential for humans because they cannot be created from other compounds by the human body, and must be taken from food.

Amino acids carry out many important bodily functions: 

  • give cells their structure;
  • play a key role in the transport and the storage of nutrients;
  • have an influence on the function of organs, glands, tendons and arteries;
  • essential for healing wounds and repairing tissue; 
  • important removal of waste deposits. Apple