All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Science
The Coca-Cola Diet (Posted on 2002-06-24) Difficulty: 4 of 5
The way to lose weight is to burn more energy than you take in. One way of burning energy is to maintain your temperature at a steady 37C (98.6F).

How much energy is required with a can of Coca-Cola? The standard formula is that the amount of energy required is:

(amount of substance) x (specific heat) x (change in temperature)

What are the numbers for a can of Coke? The can I have here says it contains 355 mL. If I were to serve it cold in a glass with melting ice, it would start off with a temperature of 0C. I don't know the exact specific heat of Coke, but I think it's fair to assume it's in the ballpark of the specific heat of water (1 calorie per mL per degree C). Coke is mostly water, anyway. Substituting those numbers gives:

355 x 1 x 37 = 13,135 calories.

Under the Calories heading on the side of the can, I read 140. Even allowing for large differences between the physical properties of water and the physical properties of Coke, that's a tremendous difference. Every can of Coke ought to actually burn a net 12,995 calories if it's served cold. These numbers can easily be verified by anybody who wants to buy a can of Coke (Disclosure: I own a little bit of stock in the Coca-Cola Company).

Drinking Coke ought to help people lose weight like crazy. So why hasn't the Coca-Cola diet caught on?

  Submitted by friedlinguini    
Rating: 2.1111 (9 votes)
Solution: (Hide)
A distinction needs to be made between regular calories (cal) that are used in physics and chemistry, and Kilo-calories (Cal) - used in nutrition.

1 Cal = 1,000 cal

So the 13,000 some (chemical) calories in the problem are only equivalent to about 13 Cal - food calories. The rest of the 140 Cal in a can of Coke comes from nutritional value of its ingredients (sugars and such).

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionProblem SolutionK Sengupta2007-05-07 12:14:53
the solution is basically right, but logic is terribleiggyb3872003-10-16 21:32:58
How to lose weightTim Axoy2003-03-20 01:50:22
argumentMack2003-02-01 18:27:38
A Digressiondelvin2003-01-15 23:17:39
ha!N__A__T__A2003-01-03 07:33:38
re: Um, This Is Very Inaccuratefriedlinguini2002-12-15 17:07:05
Um, This Is Very InaccurateMatthew Bobbins2002-12-15 11:19:08
re(2): Thanks a lot FredDulanjana2002-06-26 15:35:21
re: Thanks a lot Fredfriedlinguini2002-06-26 06:47:43
Thanks a lot FredHappy2002-06-26 06:08:02
re(4): Solutionfriedlinguini2002-06-26 05:45:24
Questionre(3): Solutionlevik2002-06-25 18:15:13
Solutionre(2): Solutionfriedlinguini2002-06-25 13:27:27
Questionre: Solutionlevik2002-06-25 11:22:30
SolutionSolutionJim Lyon2002-06-24 10:27:42
Some ThoughtsJust a guessTomM2002-06-24 10:19:41
Hey nowlevik2002-06-24 09:32:30
Please log in:
Remember me:
Sign up! | Forgot password

Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (1)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2020 by Animus Pactum Consulting. All rights reserved. Privacy Information