Need to loose alot of weight, don't know where to start.

Congratulations to have the courage to start.  You do have some tough hurdles but it is not hopeless or impossible.

1. Yes.  You need to see a doctor and a doctor who specializes in weight issues.  You need to rule out medical causes unrelated to diet that can cause weight gain.  They will be looking for conditions that affect you metabolic rate.  Most of those tests can be done by taking blood.

2. You may be able to lose weight without surgery.  But if that surgery is life saving don't discount it.  You will only be recommended for surgery after a long evaluation period by health professionals.

3.  Since you are young if you lose weight gradually you make not have a lot of problems with sagging skin.  However, it may be that you will have folds after weight lost.  That can be corrected thru cosmetic surgery.  It is your health that is of first concern.  Lose the weight.  Tackle the cosmetic part latter. 

I know your family history is discouraging.  But you can change destiny. Start with small steps.  Look at your habits and try some small changes where you can succeed.  Build on these successes.  Good luck. 

if you want to exercise every day and adjust your eating habbits im sure youll be ok otherwise i would recommend bariatric surgery

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Lose weight naturally ! Following Dr. Shintani's Eat More, Weigh Less " recommendations is like getting the effect of surgery without surgery. .

When losing weight, foods are the first things that you need to consider. So how do you do it?

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good thing you are taking the first step. it appears to be heriditary with your family history. I would :

change your diet to healthy foods (no breads, fried foods or junk foods)

drink more water before any meals.

eat more green vegetables and fruits..no iceberg lettuce or salad dressings

start walking more, exercise and look into surgery as well like the LapBand ,  Liposuction or Gastric Bypass remember just getting the surgery does not fulfill everything. you will need to change your lifestyle to becoming healthy overall.  ( eating the right foods, not starving yourself; just eat right and be more active, (walk, bike, hike, etc....you don't have to be a gym rat each day)