I stopped eating successfully for 4 months staight.its been 8 months now and I still rarely eat sugar. I noticed that my immune system was really weak and I was close to getting pneumonia last year. I was catching everything that came along and with every cold i caught I was sick for over 2 weeks.
I stopped drinking soda completely years ago. Friend's wife got a job as a dental hygenist and told me that soda is the worst possible thing you can put in your mouth so I stopped completely. But I was a candy bar and snack cake junky. With the job I had at the time I was coming across a lot of vending machines, but the vending machine was the first thing I promised myself I would quit, so I would empty my pockets the night before and no longer carried dollars or change. I didnt quit cold turkey, but I started by eliminating snack cakes as they are the bigger threat because of the hydrogenated oil they contain.
There are 50 different names for sugar when you look at the nutrition labels on the back of products. I quit eating as many as applied to what I ate every day, including fruit. Here is a list.
50 Names for Sugar
Day 1.. Sucked....everything was fine until after dinner when I usually have something sweet.
Day 3... Motivation kept me moving past the point that im starting to fiend a little for something sweet. Anger is starting to set in at this point. DO yourself a favor and let people know what youre doing. Itll save your friendships because you WILL yell at people
Week 2... Anger is intense. It was my first realization of how a junkie or alcoholic must feel. I WANNNNNNNNNNNNTTTT IT!!!!..

The same receptors in the brain effected when doing through sugar widthdrawals are the same as the receptors for cocaine withdrawals. You ARE a drug addict in rehab at this point. DOnt take this statement lightly.
Week 3... Anger begins to boil over and becomes uncontrollable. I became short tempered with everyone around... Treated every little thing that happened like it was the end of the world. Personal items with sacrificed during a daily rage. But dont do anything stupid like put a hole through your flatscreen or throw the XBOX at the dog.
1 month... Started calming down...Anger levels began to recede.
2 months.. Started noticing positive changes... Anger under control, nerves settled. Not only did I sleepthough the night, I woke up in the morning with so much energy that Id literally pop out of bed like

ready to get my day started. Clear thoughts. Most people dont know what this means.. but once it happens you will notice the difference. Everything just seems more relaxed and its easy to think about something without your mind drifting or feeling rushed to do everything.
4 months... i succeeded in what I set out to do. I went though the entire winter around sick people and germy ass kids yetmstayed healthy the entire 4 months. I got sick for about a day but recovered quickly. Sugar turns your immune system off.
My first taste of sugar was a shock to the system. FOr the first time in my life I could take a bite of something sweet and be satisfied with just one bite or was so overwhelmed that I didnt want to continue. After dinner, I can literally have a 1/8 of a teaspoon of raw honey and be done.
Tips on sticking to it...
Really take the time to understand why sugar is so bad and the many problems and diseases it is responsible for. Everyone is aware of the relationship between diabetes and sugar, but did you know Heart attacks have more to do with sugar and hydrogenated oils found in cookies and cakes, than saturated fat from red meat? Sugar is also the primary fuel for the cancer of mutation cells. So think about that chemotherapy offices that has the diet soda and bowls of candy 
Give up watching regular and cable tv. Ive been watching netflix and hulu for 6 years now. Recently watched a lot of cable when i moved and found it hard to stick to my diet. All the commercials are for stuff that is horrible for you to eat and it all contains sugar. Once youve broken that sugar habit, its easier to see how much programming your TV set is actually doing to you.
Dont overload on fruit. Fruit is the junkfood of the health world. Vegetables are for maintaining your daily body, fruit should only be eaten sparingly. ORanges dont contain nearly as much vitamin C as a red pepper or spinach.
Throughout your adventure of giving up sugar, you must study. We are taught health in school, but we are not taught good nutrition in school. You need a good understanding of WHY you are doing this so that your goals are strong and clear. If you dont build up your mind you will fail in less than a week. But if you can do it, the benefits are easy to see what you have actually been feeling like shit for all these years and its like a whole new person. You taste bud take a few months to change. There are a lot of things you might not like right now in terms of vegetables and stuff, that you might find yourself liking with your new appetite. I went from eating all junk to eating nothing but meat and vegetables in a matter of 4 months.
Word of warning..When you try to go back to eating junk food, your body lets you know really quick that thats not happening.