Why are people consuming 6000 calories? They are always hungry and eat too much food.
Why are they always hungry? They eat and drink too many carbohydrates. Too many carbohydrates leads to high blood sugar which leads to too much insulin. After the insulin does its job, the blood sugar crashes causing hunger. The cycle repeats, causing problems including insulin resistance, excess fat storage and type 2 diabetes.
What is the solution? Don't consume carbohydrates and avoid the hunger/sugar/insulin cycle.