EFAs stand for Essential Fatty Acids. Just as the name implies EFAs are essential to the human body because play a role in many different biological processes. Essential fatty acids differ from others fats in that they cannot be synthesized within the human body. This means that EFAs must be consumed through the diet. If not enough EFAs are consumed the body will sense that it does not have the nutrients that it needs to function properly. As a result it will essentially “hold on to” body fat. This is just one of the reasons EFAs are so important though.
Sure, you can lose weight quickly. There are plenty of fad diets that work to shed pounds rapidly -- while leaving you feeling hungry and deprived. But what good is losing weight only to regain it? To keep pounds off permanently, it's best to lose weight slowly. And many experts say you can do that without going on a "diet." Instead, the key is making simple tweaks to your lifestyle.
Caffeine and other stimulants do have a down side though. Since stimulants act upon the central nervous system if used too often or for too long of a time period they can begin to cause overtraining effects. These effects would be much the same as if you were working out too long and too often. This can lead to decreased energy, muscle loss, and ultimately, a lowered metabolism since your body will be trying to preserve energy.
The Grey Box of Clarification: While my earlier comment about ‘sucking it up’ was slightly facetious, there is a lot of truth to it. Hunger is an inevitable part of dieting and the more you can become comfortable with it, the more successful you’re going to be with your fat loss. Also, read this. And then sign up to my email list because it’s the best thing since Deadpool. 
When you hit the gym, the body releases a fat-liberating messenger called epinephrine, which attaches itself to fat cells and allows fat to be burned as fuel. And, you guessed it, carbohydrates come into play here. Refined carbs consumed before training suppress the exercise- and supplement-induced rise in epinephrine compared to eating the same amount of slower-digesting carbs. Refined carbs also boost insulin levels, further hampering fat-burning during the workout. Bottom line, avoid refined carbs altogether before training.
For this lightning-fast Tabata workout, pick four total-body moves (plank jacks, jump squats, etc.). Do one for 20 seconds, rest for 10 seconds, then do it again. Continue to the next move and repeat. The routine is just four minutes long—and you’ll torch 13½ calories a minute and double your calorie burn for half an hour afterward, per research from Auburn University in Alabama.
The prevailing formula for a long time on how much fat you’re going to burn was calories in minus calories out, based on your basal metabolic rate (BMR) and exercise efforts, explains strength and performance specialist Joel Seedman, Ph.D., owner of Advanced Human Performance in Atlanta. But with all the different biochemical reactions in the body, hormonal response, and endocrine function, there are an infinite number of factors that can affect how your body is storing and breaking down calories.
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