Question: Whenever I enter my school I'm forbidden to drink energy drinks. I asked them why and they listed lots of reasons why I wasn't allowed.

I asked "why is smoking not forbidden but something so simple as drinking energy drinks is?" and they replied "smoking is a personal decision and drinking energy drinks doesn't just harm you but everyone around you due to the "behaviour" you output under the influence of energy drinks".

Are there any ways I can legally get around this ban?

Answer: 
> 
> "When ever I enter my college I'm forbidden to drink energy drinks..."
> 
> 
> 

You are under a contract and bound by the rules and regulations of the college; read the contract you signed when you registered for classes and paid tuition.

That contract will stipulate what you are allowed to do and not do in classes, in your interactions with tutors and faculty, and on the college grounds, either public or private, and probably covers a dress code, phone usage, and on and on.

The only "loophole" you have available is to stop going to college.

In addition, you are 17 and a minor under the law in many jurisdictions; this means you have fewer "rights" than an adult. And, the contract is technically between your parents and the college, not you and the college.
You could evade it by getting cancer.
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Schools and colleges in the UK are required (by the Equality Act 2010) to provide '[reasonable adjustment](https://www.equalityhumanrights.com/en/advice-and-guidance/what-are-reasonable-adjustments)' for students with disability. Cancer and other debilitating illnesses [deplete energy](http://www.cancerresearchuk.org/about-cancer/coping/physically/diet-problems/managing/putting-on-weight/high-calorie-drinks) and sufferers are often prescribed high energy supplements and [caffeine-rich drinks and injectables](http://www.cancertherapyadvisor.com/cafcit-injection/drug/3107/). Some of these are marketed under brand names but are essentially identical to retail high-caffeine drinks. 

If you got this added to your education plan (typically by showing the college a prescription and a note from doctor explaining why this adjustment needs to be made) the college would be bound by law to allow you to drink them.