American English Corrections

The Brain

The brain consumes 20% of the oxygen that enters our body. The same percentage of free radicals are produced in our bodies which leads to increased oxidative stress. I think this is what you meant, but I am not 100% sure. Oxidative stress is the increase of free radicals and antioxidants in reducing   an organism. I am not sure what you meant by "reducing organism".

Antioxidants are essential for our bodies because they help us fight the attack of free radicals, which
are responsible for stealing strip electrons from complete molecules- which   a process that  eventually becomes involved in leads to diseases in our bodies, such as Alzheimer's.

This oxidative stress is associated with Alzheimer's, one of the most common diseases generated by the deterioration of neurons that trigger dementia. His Its English, for the most part, does not have noun gender, so even though the disease is assigned masculine gender in Spanish, it is has "neutral" gender in English because it actually isn't a female or a male person or animal. One area in which English does apply gender to things which aren't people or animals is with the names of ships and boats. These are usually treated as being female. Yay for breaking the grammar rules, right? Of course, words like "mare" and "stallion" encapsulate gender as well. :)  initial symptoms are
early memory deficits and subsequent disruption of language; all this is caused by the
lack of antioxidants in our body. You could also say "Its initial symptons are early memory deficits and subsequent disruption of language, all of which are caused by the lack of antioxidants in our body."

5. Cognitive impairment - the patient forgets everything learned throughout his life.
 
 
How do antioxidants play a role in reducing the risk of developing Alzheimer’s?

Natural antioxidants are those found in the daily diet. They are found mostly in fruits and vegetables, but in order for them to reach the levels required by the WHO (World Health Organization), we must consume large amounts of fruits and vegetables.

To help you understand this easier, WHO says we should consume between 500 and 800 milligrams of antioxidants daily which amounts to about 6 to 7 servings of salad a day. This is very difficult to apply to our diet, because apart from this, we must also consume other foods to make sure our diet is well-balanced.