What is the Energy Efficiency of the Human Body for Weight Loss?

  • Context: High School 
  • Thread starter Thread starter EternityMech
  • Start date Start date
  • Tags Tags
    Weight
Click For Summary

Discussion Overview

The discussion revolves around the energy efficiency of the human body in the context of weight loss, specifically through the activity of climbing stairs. Participants explore calculations related to energy expenditure and the implications for caloric intake.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Conceptual clarification

Main Points Raised

  • One participant proposes using the potential energy law (E=mgh) to calculate energy expenditure while climbing a building.
  • Another participant suggests assuming 100% efficiency for the body in energy expenditure calculations, leading to a specific caloric burn estimate.
  • A different viewpoint indicates that the body is approximately 20% efficient, adjusting the energy calculations accordingly and providing a revised estimate of caloric burn.
  • One participant expresses surprise at the number of trips required to burn off the calories from a Big Mac, reflecting on societal implications of caloric intake and weight management.
  • Another participant emphasizes the importance of engaging in enjoyable activities for exercise and maintaining a proper diet for effective weight loss.

Areas of Agreement / Disagreement

Participants present multiple competing views regarding the efficiency of the human body and the calculations related to energy expenditure. There is no consensus on the exact energy efficiency or the best approach to weight loss.

Contextual Notes

Participants rely on different assumptions about energy efficiency and caloric conversion, which may affect their calculations. The discussion does not resolve these assumptions or their implications.

Who May Find This Useful

This discussion may be of interest to individuals exploring weight loss strategies, those studying human physiology, or anyone curious about the relationship between physical activity and caloric expenditure.

EternityMech
Messages
95
Reaction score
0
so I am going to use the potential energy law e=mgh to lose joules(fat) the problem is that what's the energy effiency of the body i can't find that anywhere. I am climbing a 22.5m apartment building and my weight is 114kgs (im not fat just big boned)
 
Physics news on Phys.org
Why not assume it's 100% efficient?

E = 114 * 9.8 * 22.5m = 25,000

1J = 0.24 calories

so 25,000J = 6000 Calories.

The bad news is that "calories" on a packet of food are actually kilocalories.

So one trip to the top burns just 6 food calories

http://www.weightlossresources.co.uk/calories.htm
 
Google suggest you should assume the body is about 20% efficient so multiply by 5. One trip up is about 30 food calories. Looks like a BigMac is about 490 food calories or 16 trips up.

Edit: Got to laugh. Google has already changed the banner advert I see at the top of the page from one adbertising solar panels to one advertising a weight loss system.
 
16 trips just for a bigmac?! no wonder everybody is fat.
 
Climbing stairs is incredibly tedious. You're better off doing something more enjoyable which you will commit to doing for a long period of time, and it's absolutely necessary to eat properly.
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 18 ·
Replies
18
Views
3K
  • · Replies 38 ·
2
Replies
38
Views
7K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
2
Views
2K
  • · Replies 17 ·
Replies
17
Views
4K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 10 ·
Replies
10
Views
2K