How Ridley Scott got my brain working for a 5 Metro station ride

So I just came back from watching Prometheus and certain scenes in the movie got me thinking about evolution.

Did you see how the 2000 year old humans present at that queer planet were so much bigger than the present day humans? Odd, isn't it? We all understand humans evolve over a period of time, good or bad irrespective, it's just a matter of how one perceives it.

So let's assume that humans, 2000 years ago, though had started agriculture, were hunters to an extent. So their bodies needed to be bigger and stronger. As we evolved, our bodies became smaller as we no longer needed to be of that built, neither have the kind of strength they did. Given how we've grown so accustomed to technology, lead a sedentary lifestyle and rely so little on hunting (directly), and given the depletion of natural resources, our guide to survival and natural evolution would result in our bodies becoming smaller.

When our bodies become smaller and weaker, hunting will go down to an extent. This might result in us relying more on vegetables, resulting in us becoming primarily a vegetarian society. On the other hand, let's assume that technology allows us to hunt a lot more with little human intervention.

If we do become a vegetarian society, two things will happen. The vegetation will go down as humans and animals both rely on the greens. Given that the number of animals have gone up, there could be a chance that herbivorous animals become carnivorous for survival and consume other animals and also humans, who will already be dying due to lack of vegetation. This is when human's survival tactics kick in and they start hunting again resulting in a gradual decrease of animals and lesser reliance on vegetation. Us becoming hunters again means we get bigger and stronger.

If we allow technology to hunt for us, the number of animals will go down considerably. Eventually we would have to rely on vegetation. And we become a vegetarian society.

Of course, here I'm not assuming that humans found a way to live on other planets. Also, I'm in no way a biologist and things written here might as well be the purest form of fiction :P

Did I ever tell you my and Darwin's birthday is on the same date? :) Also Lincoln. Maybe I'll write one political piece too.