Health 101: Ignored habits that leave us more susceptible to diseases

Heavy metal toxicity; Example - Lead/mercury from water, canned fish, non-stick pans, wall paint, plumbing, etc)
Formation of Free radicals in body via burnt, overcooked and microwaved food
Overconsumption of Omega 6 oils (animal fat, seed oils, etc)
Underconsumption of Omega 3 oils (fish oil, flaxseeds, etc)
Underconsumption of Omega 9 oils (Olive oil)
Consumption of any type/amount of sugar (natural sugar is also bad)
Consumption of any amount/type of tobacco
Underconsumption of fiber, prebiotics, and probiotics from natural sources
Overconsumption of alcohol (anything beyond 2 drinks/day is bad)
Consumption of milk and grains (causes bloating, acne, indigestion, etc)
Stress - Periodic and repetitive occurance of Overthinking, Anxiety, Panic
Absence of physical activity - you should walk at least 30 minutes/day
Dependence on OTC (over-the-counter) medication. Example - Tylenol, Aspirin for headaches.
Continuance/dependence of prescription medications beyond need/recommendation.
Lack of sleep (anything lesser than 7hrs is bad)
Lack of disciplined sleep cycle (sleep no later than 10PM)
Repetitive change in sleep cycles (due to travel, timezone changes, jetlag, overtime, etc)
Exposure to air pollutants in traffic or industrial areas
Underconsumption of water (pain during urination is a symptom)
Any Steroid based Medication (compromises body's hormonal balance permanently)