Caffiene and energy source

[RunDown]

Hi everyone,

A friend of mine is currently lacking some focus and willpower during weight training, to whom I suggested using some pre-workout.

He is worrying about that most pre-workout products contain caffiene, and by taking them he would be using energy from the caffiene, instead of from burning fat, during workout.

I know the above is bro-science, because first of all caffiene itself (not certain types of fatty coffee as a drink) contains minimal calories; secondly body doesn't just burn fat to provide energy if there is no other energy source, fat burning is done by lipolysis; and not to mention, caffiene actually helps increase calorie expenditure and is an ingredient in many fat burners.

However, these are just my own understandings, I am seeking better, perhaps more detailed, more science-backed facts to support my theory. Can someone knowledgeable in nutrition / supplement please help?

Thank you!

[Blainex]

As your neurons fire throughout the day, a neurochemical called adenosine builds up in your body. The nervous system uses special receptors to monitor your body�s adenosine levels. As the day wears on, more and more adenosine passes through those receptors�and it makes you sleepy. It�s one of the reasons you get tired at night.

Caffeine, however, is a stealthy impersonator. It�s the same size and shape as adenosine, and when you sip your morning joe, your adenosine receptors can�t tell the difference. Specifically, caffeine attaches to the A1 receptor. With caffeine docked at the receptor, a lot of your body�s adenosine molecules can�t enter. It creates a traffic jam of sorts. With all that adenosine blocked, the caffeine keeps you from getting tired.

But that�s not where coffee�s kick comes from. With the adenosine receptor clogged, neurotransmitters like dopamine and glutamate can get a head start. Your dopamine levels swell, giving you a mild jolt of energy. In a way, caffeine is like a bouncer. It blocks the door, keeping the tired molecules out while the more stimulating molecules party on.

caffeine is zero calories, thus you're not using it for energy. it works as described above.

[KimJong-il]

Hi everyone,

A friend of mine is currently lacking some focus and willpower during weight training, to whom I suggested using some pre-workout.

He is worrying about that most pre-workout products contain caffiene, and by taking them he would be using energy from the caffiene, instead of from burning fat, during workout.

I know the above is bro-science, because first of all caffiene itself (not certain types of fatty coffee as a drink) contains minimal calories; secondly body doesn't just burn fat to provide energy if there is no other energy source, fat burning is done by lipolysis; and not to mention, caffiene actually helps increase calorie expenditure and is an ingredient in many fat burners.

However, these are just my own understandings, I am seeking better, perhaps more detailed, more science-backed facts to support my theory. Can someone knowledgeable in nutrition / supplement please help?

Thank you!

Caffeine is one of the most effective fat burners you can use.

I have this link on hand about caffeine and exercise you may be interested in.
http://www.edb.utexas.edu/ssn/SN%20P...%20Perform.PDF

[DamonX]

Caffeine itself contains zero calories , it increases thermogenesis and metabolism.

[danielmoo]

Caffeine is one of the most effective fat burners you can use.

I have this link on hand about caffeine and exercise you may be interested in.
http://www.edb.utexas.edu/ssn/SN%20P...%20Perform.PDF

Caffeine itself contains zero calories , it increases thermogenesis and metabolism.

Disregard his broscience and listen to these guys. ^

[Msistine]

Hi everyone,

A friend of mine is currently lacking some focus and willpower during weight training, to whom I suggested using some pre-workout.

He is worrying about that most pre-workout products contain caffiene, and by taking them he would be using energy from the caffiene, instead of from burning fat, during workout.

If your friend thinks this it's time for you to find a new friend.

[TheGilmore]

The body is always burning and storing fat. How much of a deficit or surplus you're in determines the rate of each.