The 2A is normally fairly balanced which is why it is so adaptable. They adjust their behavior to the person they are with or to the situation. They easily mimic others. Basically they have a little bit of everything (that’s why they are the middle type) which allows them to play any role. They are jack of all trades but master of none.
NOW, to quote one of my friends who is a one of the smartest functional medicine specialist I know “Everybody has a GABA problem”. The 2A is less affected than a 2B when that happens because they can more easily rely on serotonin than the 2B.
Normally the more easily adaptable someone is, the more efficient is his serotoninergic system. So a Type 1A and 3 have lower serotonin activities: these 2 types are extremely rigid. The 1B has the highest serotonin level (which is why a lot of 1B athletes are very lazy and laid back most of the time and are easy to get along with; but when the heat is on, they are machines). The 2A is similar in that they also tend to be lazier unless the heat is one. Both types are more prone to procrastinating.
The 2B has the lowest GABA level of all the types. That’s why they are so emotional. What is the connection?
Glutamate (an excitory neurotransmitter) is the precursor to GABA. As such it is pretty much impossible to have a high level of both since glutamate is converted to GABA. 2Bs have a very high level of glutamate. Here are the symptoms of high glutamate:
Hypersensitivity to sensations
Tendency toward losing control of his thoughts, creating emotional scenarios
Open display of emotions
Easy addiction to anything making him feel good
Easily fall in love
Responds badly to failure (hard on himself)
Attracted by beautiful things
Loves shopping and buy by emotion
Rapid changes in behavior (from extreme joy to extreme sadness for example)
Which are pretty much all traits of 2Bs.
The 2B having high glutamate (that’s why they are so emotional) means that they are not efficient at converting glutamate into GABA; which is why they have the lowest GABA level.
So they have to rely more on serotonin to inhibit/calm down their CNS. The problem is that they don’t have a lot of it (not anywhere close the 1Bs). And since they have low GABA they easily deplete serotonin. This is the reason why 2Bs are more prone to binging out on sugar when they are stressed or down (to increase serotonin) and to depression.