Common disorders of the immune system

Overactivity of the immune system can cause:

  • Allergic diseases; and
  • Autoimmune diseases

Underactivity of the immune system (immunodefiency):

  • These can be inherited such as CVID and SCID
  • Sometimes arise as a result of medical treatment such as corticosteroids or chemotherapy
  • It can also be caused by another disease such as HIV/AIDS or certain types of cancer

Having an underactive immune system simply means that it does not function correctly and this makes people who have them vulnerable to infections and in the most sever cases, could be life-threatening.

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Day-to-day memories depend on the hippocampus

The hippocampus - a structure in the brain - controls the brain's ability to learn and form memories of day-to-day facts.

But research found that the activity in the hippocampus steadily declines with age. The memory of subjects in their 50s and 60s weakened as subjects recalled events that were up to 12 years old but reached a plateau during older remembrances.

  • While French fries are consumed globally, different cultures consume them with different toppings or condiments.
  • Americans have them with ketchup, while the French with mustard. Japanese have their fries with green curry or soy sauce, while Malaysians eat them with chilli sauce.
  • The Belgians, who consider themselves as the place where french fries originated, eat them with mayonnaise.

Add an easy-to-achieve goal to your to-do list. The satisfaction of ticking off a small task is linked with a flood of dopamine. 

Each time your brain gets a whiff of this rewarding neurotransmitter, it will want you to repeat the associated behaviour.

  • Melancholic depression, as described by Hippocrates, was considered a unique condition that struck people out of the blue.
  • It is now known as "endogenous depression" (coming from within) and different from depression in response to external stressors.
  • In 1980, depressive disorders were remodeled as a single entity that only varies by degrees of severity.

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