South Africa Flag logo

South African Skeptics

September 17, 2019, 12:12:47 PM
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
Go to mobile page.
News: Follow saskeptics on twitter.
   
   Skeptic Forum Board Index   Help Forum Rules Search GoogleTagged Login Register Chat Blogroll  
Pages: 1 2 [3]  All   Go Down
  Print  
Author Topic:

Lactose tolerance a key to evolution?

 (Read 5767 times)
0 Members and 1 Guest are viewing this topic.
beLIEf
Full Member
***

Skeptical ability: +1/-0
Offline Offline

Posts: 245



atheistinafrica
WWW
« Reply #30 on: May 28, 2011, 12:15:53 PM »

Yes that would totally make sense as not only would people be smaller because of less food, but having a smaller body mass also requires less calories to sustain. Isn't nature clever?!  Smiley
Logged
Lurkie
Full Member
***

Skeptical ability: +3/-0
Offline Offline

Posts: 132


« Reply #31 on: May 29, 2011, 14:05:42 PM »

One could also look at it from the opposite side and argue that in situations where food is scarce, such as among the hunter-gatherers, there is a competitive advantage to being small and able to survive on less food.

The surviving on less food idea is an interesting one and opens up some other avenues of discussion. Lewis Wolpert discusses this briefly in his recent book "How we live and why we die". Simplistically, one might think that more food = better growth, healthier bodies, better reproductive ability, better survival, better propagation of genetic material. However, there is evidence from animal studies that eating less (a lot less!) can significantly extend the lifespans and reproductive age in a variety of animals.

In rats, the studies showed that a 50% reduction in food led to life spans that were 40% longer than the well fed rats. More relevant to this discussion is that the max reproductive age of female rats almost doubled. Sufficient vitamin and mineral intake was important but it didn't matter whether the calories came from fat, protein or carbs.

Alarmingly, if the restricted feeding regime was stopped, the aging process then actually seems to be accelerated.

Logged
Hermes
Hero Member
*****

Skeptical ability: +18/-2
Offline Offline

Posts: 1137



« Reply #32 on: May 29, 2011, 15:36:33 PM »

there is evidence from animal studies that eating less (a lot less!) can significantly extend the lifespans and reproductive age in a variety of animals

Eating too much can of course be unhealthy.
« Last Edit: May 29, 2011, 17:07:19 PM by Hermes » Logged
Lurkie
Full Member
***

Skeptical ability: +3/-0
Offline Offline

Posts: 132


« Reply #33 on: May 29, 2011, 16:00:28 PM »

Eating too little causes time to dilate - hence the apparent longevity. Life just seems longer because you're so darn hungry the whole time.  Wink
Logged
beLIEf
Full Member
***

Skeptical ability: +1/-0
Offline Offline

Posts: 245



atheistinafrica
WWW
« Reply #34 on: May 29, 2011, 16:05:19 PM »

there is evidence from animal studies that eating less (a lot less!) can significantly extend the lifespans and reproductive age in a variety of animals

Eating too much can of course be unhealthy.


Yes there are loads of articles about the benefits of having a lower calorific intake and obviously eating less of certain foods. Longevity being the most widely claimed benefit. Even if the reduction is for a limited period of time.

So could it be that religions - most of which have periods of fasting or abstinence from certain foods have also contributed to people in certain nations living longer and healthier lives? (or at least offset some of the lives lost in holy war or the counter- health benefits of being wracked with guilt
Logged
Lurkie
Full Member
***

Skeptical ability: +3/-0
Offline Offline

Posts: 132


« Reply #35 on: May 29, 2011, 16:13:45 PM »


So could it be that religions - most of which have periods of fasting or abstinence from certain foods have also contributed to people in certain nations living longer and healthier lives? (or at least offset some of the lives lost in holy war or the counter- health benefits of being wracked with guilt

I wonder. Is religion equivalent to fad diets? For example, the sort where you only eat cabbage and lemons for a month and hope to morph into Kate Moss.
Logged
rwenzori
Sniper
Sr. Member
****

Skeptical ability: +7/-1
Offline Offline

Posts: 403


Merda accidit.


« Reply #36 on: May 29, 2011, 16:19:18 PM »

I wonder. Is religion equivalent to fad diets? For example, the sort where you only eat cabbage and lemons for a month and hope to morph into Kate Moss.


LOL, good one. Not with Pikkiwoki though - pork & coconuts prepare you for sumo.
Logged
Lurkie
Full Member
***

Skeptical ability: +3/-0
Offline Offline

Posts: 132


« Reply #37 on: May 29, 2011, 16:37:47 PM »


LOL, good one. Not with Pikkiwoki though - pork & coconuts prepare you for sumo.

Pikkiwoki says eat your brocci
Logged
Hermes
Hero Member
*****

Skeptical ability: +18/-2
Offline Offline

Posts: 1137



« Reply #38 on: May 29, 2011, 17:11:44 PM »

Pikkiwoki says eat your brocci
Cheesy
Are you aware of instances where populations have gone into natural decline because of an abundance of food?  I don't mean soil that is too rich for certain plants.
Logged
rwenzori
Sniper
Sr. Member
****

Skeptical ability: +7/-1
Offline Offline

Posts: 403


Merda accidit.


« Reply #39 on: May 29, 2011, 17:20:40 PM »

Pikkiwoki says eat your brocci

LOL! If Pikkiwoki keeps on making unreasonable demands, he's destined for the great divine scrap-heap, along with Yahweh, Ra, Thor and countless others. These gods need to keep in touch with their markets.

Anyway, sorry for the derailment - temporary I hope.
Logged
Lurkie
Full Member
***

Skeptical ability: +3/-0
Offline Offline

Posts: 132


« Reply #40 on: May 29, 2011, 17:38:25 PM »

Are you aware of instances where populations have gone into natural decline because of an abundance of food?  I don't mean soil that is too rich for certain plants.

No, I've never seen any references to this. I could flippantly suggest that the US, UK and many other developed countries, which are in the grip of an obesity epidemic, are examples.

There are well documented examples of the opposite effect though. There's an area in Japan where the population consumes less (about 20% less) food than the Japanese average because of cultural reasons. This group has a higher than normal population of oldies reaching the 100 year mark.
Logged
Pages: 1 2 [3]  All   Go Up
  Print  


 
Jump to:  

Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC
Page created in 1.262 seconds with 23 sceptic queries.
Google visited last this page November 03, 2018, 22:37:40 PM
Privacy Policy