Can sugar be stored as fat?

..WILL convert sugar TO FAT when its not used !!!

PREFACE: It really depends what do you mean by excess? Do you mean excess calories that are in the form of simple sugars?

See sugar is an awesome maconutrient :D
Sugar is a simple carbohydrate, and we say simple, b/c it digests faster because it has less "branches" on it. IF you take a look at a carbohydrate (made up of carbon, hydrogen, and oxygen molecules) you see different types. You can have highly complex which have many "branches" and therefore take more time to digest , or less branches and are quickly absorbed.

Simply put, simple sugars and all carbohydrates begin digesting in your mouth immediately upon chewing. This is why you can taste your sweets so fast. "Melts in your mouth, not in your hands!" a perfect slogan for M'n'M's.

Now sugars are the purest form of energy as theonly byproducts are CO2 essentially, and that's what plants need to remake carbs. So we'lre a perfect cycle with the earth :D. Pretty cool eh?
This is possibly why our bodies use carbohydrates as an energy soruce first, and why we can also store it in our muscles and in our liver. The storage form of the carbhoydrate is called glycogen (glucose is a phosphate).

So lets say your body has no liver glycogen and no muscle glycogen whatsoever...this wouldnt happen and I dont believe could ever happen? Unless you starved yourself. But i dont know how long that would take. I do know that its typically possible to delete your liver stores and stores in specific muscles after instense training, but thats not in ALL your muscles...

If you eat enough calories for your body to use immediately then the "excess" will be converted into glycogen (after its converted into glucose) and then stored in your muscles and liver. You will also have some flaoting around in your blood. Also known as blood sugar levels. This is why its important to eat "healthy" becuase complex carbs are slower to digest and thus leave a "trickling" effect of glucose into the blood stream.

Excess carbs beyond what your body is storing will be CONVERTED into fat molecules, and yes this happens often as obese people, and anyone, who doesnt exercise has no need for much energy.

Think about this, if you ran a store business and sold anything, lets say balloons. :D
You have 3 sections of yoru ballons to sell from. You have your first lineup of balloons and thats outside the store on the tabletops so if your customers need ballons quick, they can just grab them and go (leaving of course behind the money). The second line they must pass through the door and buy from the shelves once the balloons on the outside are "depleted".
But...If you never sold what was on your shelves in the main storefront, how and why would you ever need the reserves in the back?
How about one day you had a rush of customers and they completely depleted your sources, then you had to run in the back and grab from the reserves. BUT!! people kept coming!! OH NO!!! :D You would exhaust your ballons completely.

Now lets say your completely full of supplies. But you get more ballons than needed??? Oh nO!!!

What to do now! Well you have no room on the ground, so you'll have to convert them into into plastic (which requires a little work) and store them along the sides of the shelves so that if this does happen to where you run out of balloons, you have some plastic (hwich is made of the same materials as balloons) but you'll have to do a little extra work to turn them back into balloons but you can still "use" them.

NOTE: I will finisht his later :)I hae to hit the gym.. lol.
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Priming your body before a workout [Warmup]: http://www.myfittribe.com/forums/best-ways-prevent-treat-post-work-out-s...

Well excess anything will eventually turn into fat to be stored by the body.
You'll have to wait for one of the "in-depth" guys to answer this, like the doc, Brian, Jamo, or Will... because excess of protein, carbohydrates, and fats are all converted differently but will eventually.

When we take in excessive sugar and once the body sense that there is too much, insulin is released to take the excess sugar out of the bloodstream and store it by converting it into glycogen. It stores it in all types of cells and after a workout, a lot of this energy gets pushed into muscle cells. The amount of glycogen stored in the liver is small (comparatively speaking). The entire reserve cannot last more than a day of activity. Excess sugar above and beyond what can be stored as glycogen is then stored as palmitic acid, a saturated fatty acid. Now you see how excessive sugar (calorie) intake leads to extra fat in the body. [1]

Quick-Researc Source [1]

This article has some good points but I don't agree with everything. Their idea that 'sugar' (i took this to mean all carbs, complex and simple) is not good for the brain nor is it the primary source of energy.

I disagree,(at least as far as carbohydrates not being a good source of energy, sugar is not, complex carbs are) i just read a few days ago that some of the failure points in the Atkins diet is because of the low carb levels, the brain cannot function as well because it gets energy more efficiently through complex carbohydrates than it does trying to use ketones (energy) from fat.

I hope this helps. Your friend in "medicine" might want to rethink what he told you. Sugar will turn into fat if consumed in excess!!!! Period. Just because it goes through a few biological processes first does not mean it wont turn into fat, yes, it gets turned into something else first before getting stored as fat... but its the excess sugar that was converted.

Also, if this doesnt answer it well enough, you could always do an anecdotal study!! :D Why dont you go have your friend eat nothing but sugar for two weeks (make sure he eats his maintenance calories ;) ;)). Weigh him before, take his body fat %, and weigh him after the two weeks. Make him do it, since hes the one telling you this information >_<. Tell me how much body fat he gains...