Cholinergic activity arises whenever the neurotransmitter acetylcholine is used in the body. Acetylcholine acts on the whole nervous system, from enhancing learning and memory to promoting relaxation, digestion, muscle activity, and even sexual arousal. Read on to learn all about it and factors that may boost its levels naturally.<\/p>\n
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While the fight-or-flight response uses mostly norepinephrine<\/a> to bring the body into a state of action, acetylcholine is what balances and reduces this response. Cholinergic activity uses acetylcholine to make the body ready to “feed and breed” and “rest and digest.”<\/strong><\/p>\n Acetylcholine is part of the so-called \u201cparasympathetic nervous system,\u201d boosting all activities that should happen at rest. And with rest also comes a higher state of consciousness: selective attention, perception, and memory<\/strong> [R<\/a>].<\/p>\n This may seem counterintuitive at first: how can the same molecule help digestion, sexual activity, and cognition? But imagine pondering deep thoughts or digesting food while being attacked by a lion.<\/p>\n Scientists explain that the sympathetic – fight-or-flight – nervous system helps the body survive when under threat, while the parasympathetic takes care of all the rest [R<\/a>].<\/p>\n In normal situations, the fight-or-flight and rest-and-digest systems work together. Research suggests that a healthy amount of norepinephrine increases motivation<\/a>, while acetylcholine boosts cognition. Acetylcholine then syncs dopamine<\/a> neurons to control the brain\u2019s reward system and whether it\u2019s worth it to act on motivation [R<\/a>, R<\/a>, R<\/a>, R<\/a>, R<\/a>].<\/p>\n To have motivation, actually start learning something new, and to use your memory and focus to retain this knowledge – science says you need a balance of neurotransmitters.<\/p>\n Acetylcholine is made in cholinergic neurons from choline<\/strong><\/a> and acetyl-CoA<\/strong>, which comes from burning sugars and fats. Choline cannot be made by the body, so it has to be taken in through diet [R<\/a>, R<\/a>, R<\/a>].<\/p>\n After it achieves its effects, acetylcholine is broken down by an enzyme called acetylcholinesterase<\/a>. If a lot of acetylcholine is broken down, its levels decrease too much. Drugs that block this enzyme boost cognition and are used in Alzheimer\u2019s disease (such as galantamine<\/a>) [R<\/a>].<\/p>\n Cholinergic activity of the rest-and-digestion system occurs in [R<\/a>]:<\/p>\n According to one experimental theory, acetylcholine may directly reduce inflammation in the brain. The vagus nerve<\/a> also uses acetylcholine to reduce inflammation in the body [R<\/a>].<\/p>\n Some studies suggest that, with aging, cholinergic activity slowly becomes less and less efficient. Less acetylcholine is released from brain cells, and cells become less sensitive to the acetylcholine that\u2019s there. This is hypothesized to be one of the causes of a failing memory in older people [R<\/a>].<\/p>\n But aside from aging, scientists suspect that this system goes awry in many other diseases, such as in Alzheimer\u2019s disease, Parkinson\u2019s disease, schizophrenia, and epilepsy. What they all might have in common is low acetylcholine, poor cognition, and brain inflammation [R<\/a>].<\/p>\n However, complex disorders like Alzheimer’s or Parkinson\u2019s disease always involve multiple possible factors<\/strong> – including brain chemistry, environment, health status, and genetics – that may vary from one person to another.<\/p>\n Acetylcholine can act on the two different types of receptors in the body: nicotinic and muscarinic<\/strong>.<\/p>\n When we talk about low-cholinergic-activity-associated disorders, it\u2018s important to know that these disorders are not necessarily due to acetylcholine levels or production as such. They can stem from issues with acetylcholine breakdown or the availability of certain acetylcholine receptors. Many types of nicotinic and muscarinic cholinergic receptors exist.<\/p>\n Additionally, the majority of studies covered in this article deal with associations only, which means that a cause-and-effect relationship hasn\u2019t been established.<\/strong><\/p>\n For example, just because Alzheimer\u2019s disease has been linked with low acetylcholine in certain brain areas doesn\u2019t mean that Alzheimer\u2019s disease is caused by low cholinergic activity. Data are lacking to make such claims.<\/p>\n Some studies suggest that poor cholinergic activity and low acetylcholine in the brain may cause cognitive decline and poor memory in people with dementia. Drugs used to slow down dementia work precisely by increasing acetylcholine in the brain [R<\/a>].<\/p>\n<\/a>Where Does Cholinergic Activity Occur?<\/strong><\/span><\/h3>\n
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<\/a>Types of Cholinergic Receptors<\/strong><\/span><\/h3>\n
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<\/a>Associated Diseases<\/span><\/h3>\n
<\/a>Diseases Linked to Low Cholinergic Activity<\/strong><\/span><\/h2>\n
<\/a>Dementia<\/strong><\/span><\/h3>\n