Weight gain (main factors causing it)

1. 1. Depraved sleep.

   A number of recent medical studies have linked sleep deprivation (too little or too much sleep) with an increased risk of obesity. The reasons for such relationship range from metabolic disruption to increased appetite due to the production of hormones like leptin or gherin.

   2.  Stress.

   Going through three-foot-long to-do list, family life, social activities and trying to remember all the bills to be paid on time can take a huge toll on your overall health. Stress tends to trigger the production of hormones like leptin and cortisol which promote abdominal weight gain as well as hunger and food cravings.

   3.  Friend’s choice.

   It sounds unlikely to believe but a 2007 study published in the New England Journal of Medecine found that individuals had a 57 % greater chance of becoming obese if they had a friend who became obese in the same time frame. Simply saying, if you have a friend who goes to gym you will likely to do so too and if you have a couch-potato friend who likes to improve his TV viewing experience armed with beer and chips day by day then you’ll probably indulge that lifestyle.

   4.  Not eating enough.

   This is certainly true to an extent: if you use more calories in a day then you take it in trough food you will loose weight. But the back side of the moon is that if you go too far in calories restriction your body will try to compensate the lack of calorie intake by slowing down your whole metabolism (which is bad because you’re gonna burn your calories slower).

   5.  Polluted air.

   Mouse (not Mikkey) again. Researchers have found that mice who were chronically exposed to fine particulate air pollution developed insulin resistance, inflammation and oxidative stress, and changes to the very cellular structures that help your body turn food into usable energy.

   Those of us who has misfortune to breath polluted air please invest in quality air filters or purifiers.