### acid:

Lactic acid
* Some lactic acid builds up in meat
  - muscles
* Some lactic acid enters blood streams
* Some lactic acid is produced by bacteria
  - starter bacteria
  - prevents growth
* acccumulates when a muscle is overworked.
* accumulates during exercise
  - in the muscle tissue as a fish is played
* acts on the protein in the milk to make yoghurt thick and sour.
* build up in muscles inhibits muscle contractions
  - leads to the symptoms of trematol poisoning
* builds up as anaerobic respiration switches on, and it can quickly become toxic
  - in the muscles, causing that sore and tired feeling
* by product of metabolism that is formed during exercise.
* by-product of anaerobic energy production
  - glycolysis
* byproduct of energy metabolism
  - glucose metabolism
* can cause sore muscles
  - reach toxic levels, causing muscle cramps and fatigue, in stressed muscle groups
* causes cramp
  - muscle stiffness and soreness
  - muscles to hurt
  - rigor mortis
  - soreness when it builds up in muscles
  - the muscle pain when one runs too fast for too long
* contributes to better digestibility of the bread product and gives it a unique flavour
  - fatigue in muscle and oxygen debt, and the liver eventually reconverts
* creates efficient fermentation because it is stronger than the volatile acids.
* cuts down on endurance.
* forms as a by-product of energy production by the muscles
  - in milk due to the action of fungi and bacteria acting on the lactose sugar
* has two enantiomers.
* helps produce growth hormone.
* increases in the active muscles.
* interferes with the muscles ability to contract.
* is also very hydrating
  - an acidulant that adds tartness and controls acidity
* is an alpha-hydroxy acid with keratolytic properties
  - example of a weak acid
  - carboxylic acid
  - chemical compounds
  - converted back to pyruvic acid by liver cells
  - especially effective in combating pathogenic bacteria
* is formed in some microbes as well as in the muscle cells
  - when carbohydrates break down, usually during exercise
* is one of the most effective AHAs and has the lowest irritation potential
  - way of keeping all the cells, brain and muscle, going
  - only temporaly
* is present after working a muscle, producing natural growth hormone
  - in most foods, and, of course, is present throughout our bodies
* is produced by muscles as they run out of oxygen over prolonged bouts of exercise
  - the microbial fermentation of sugars such as glucose or hexose
  - during exercise when the demand for oxygen in muscles exceeds the supply
* is produced in animals and is associated with muscle fatigue
  - large quantities by heavy, high physical loads
  - response to the alkalosis of hyperventilation
* is produced in the muscles during intense activity
  - presence of decreased oxygen
  - more readily during anaerobic exercise, like sprinting
  - when glucose is metabolized through the energy production cycle
  - ten-times stronger than proprionic acid
  - the alpha hydroxy acid found in milk
* is the main acid in milk and has a much lighter taste
  - cause of enamel decalcification
  - most stable and most palatable of all common silage-produced acids
  - predominant volatile fatty acid in the best-quality silage
  - primary cause of muscle soreness
  - waste product of exercise that enhances fatigue and muscular soreness
* is toxic in large amounts, and therefore produces fatigue
  - to many cells and leads to muscle fatigue
  - what causes muscles to burn after strenuous exercise
* metabolite formed in the body during muscular activity.
* milder acid than malic acid.
* natural constituent of the human body and has several proven functionalities.
* naturally occurring organic acid, which is present in sour milk and molasses.
* normal byproduct of muscle metabolism.
* primary component in the skin's natural buffer system.
* producing bateria produce mainly lactate as a metabolite from glucose.
* registered disinfectant.
* represents a small fraction of the chemicals of commerce in the United States.
* seems to be a better compound to rub on twice daily.
* strong acid that has been implicated with fatigue.
* ubiquitous product of energy metabolism.
* waste product or toxin that causes muscle to fatigue and ultimately fail.
+ Enantiomer: Stereochemistry
+ Yoghurt: Dairy products
  * Yogurt', or 'yoghurt', is a dairy product made by bacterial fermentation of milk. The lactose in the milk becomes lactic acid when it is fermented. Lactic acid acts on the protein in the milk to make yoghurt thick and sour. Yoghurt made from cow's milk is called dairy yoghurt. It is produced using a culture of 'Lactobacillus delbrueckii' subsp. Soy yoghurt is made from soy milk.