by PWrong » Fri Jul 23, 2004 10:59 am
Your health teacher actually told you that vegetarianism is unhealthy? If a teacher said that here they'd probably get fired. That's not the opinion of most health organisations anyway. In Australia, high school students do a health course every semester, it's not optional. What makes you think I would even be a vegetarian if I didn't know any facts? It occurs to me that not many people make a conscious, informed desicion to become a non-vegetarian, they just make the decision to stay that way. Anyway, I just told you the facts. Meat isn't neccessary for anyone. I don't believe anything different from anyone else, I just act on what I know. I told you, not all Hindus are vegetarian. A lot of Buddhists are, but only because they know the benefits of it. But religion has nothing to do with health, you're just saying that to sound politically correct. A vegetarian Hindu might not be any healthier than an atheist or Christian vegetarian (unless of course a Hindu god is protecting their health, which is possible).
Now, back to the topic. Regardless of whether vegetarianism is healther here, in 3D, it obviously can't be that much healthier, or carnivores would be extinct. But in 4D, since we don't even know whether iron, protein etc exists, we can only look at the actually energy/mass of the foods, and other things we can assume about 4D life.
Speaking of which, to discuss this properly, we should define some terms and make reasonable assumptions about 4D. This should properly be done by a biologist or a student learning biology, but it shouldn't need more than a basic understanding of biology, since there's no specifics. So I'll have a go, and if I assume anything that might be wrong, someone can correct me.
We've already defined an "animal" as something that moves, so we can assume that they need certain internal body parts in order to move. I would define a 4D "muscle" to be a part of the body that allows the animal to move. I think we also should assume that they have "fat" to store energy, and "blood vessels" to transport "air"(oxygen is too specific) around the body. They also need organs, but each organ is different, so it's too complicated for now. None of these need be anything like what we have in 3D, but there are some things that they should do.
Fat: Any cell that stores extra energy from food and takes up some mass. We should consider fat cells as a good thing, since humans are probably the only species where fat is bad. Since energy dissipates more easily in 4D, fat will be designed to hold the enery in, so fat cells might be thicker, and might need to take up more space than 3D fat. Fat might not even be practical or neccessary in 4D, if it's too difficult to hold energy for long.
Muscle: Required to move the animal around. They require energy to work, and mass to make them. Animals with stronger muscles will presumably be more fit than other animals, and preffered by evolution.
Blood vessel: Transports "blood", around the body. Blood is probably a liquid, but I suppose it could be a gas. Blood carries some required chemical, "air", around the body. This is probably taken from the air, like oxygen, but maybe they suck it out of the ground, or it comes in a liquid form like water, or it only exists around certain areas, and they can hold their breath for days. But no matter what the "air" is, they need to get it to every part of the body, so 4D blood vessels probably obey certain rules to achieve this. Both 3D and 4D bodies have these requirements:
1. Get every point in the body within a certain distance from a blood vessel. Some places need more blood than others.
2. Keep the total volume of blood vessels to a minimum.
They can achieve this in either dimension by following these simple rules.
1. Grow close to other blood vessels,
2. But not too close.
3. If there aren't many blood vessels nearby, grow thick, and sprout slightly thinner blood vessels.
4. If there are blood vessels nearby, stay thin
These rules, or rules like these, probably lead to fractal patterns like 3D blood vessels.
I think we can assume that blood is less healthy to eat than the surrounding tissue. Maybe not for 4D vampires, but maybe other animals. So it might be helpful to find out whether 4D blood vessels take up a higher ratio to flesh than 3D blood vessels. If they do, that would make 4D flesh less healthy. I might be able to find a cellular automata on the net that simulates blood vessel development, and then calculate the ratio in both 3D and 4D.
An animal that eats muscle will presumably gain mass to build its own muscle, while an animal that eats fat will probably gain energy, once it extracts it from the fat. Since fat is designed to hold energy in, which is more difficult in 4D than 3D, it's probably more difficult for an animal to extract the energy. So fat might be even harder to digest in 4D than 3D.
Ok, I haven't quite covered animals, but I might as well make a start on 4D plants. Assuming that 4D life exists on a planet where they have continuous access to sunlight, it's likely that they would evolve some form of photosynthesis. There's not many other sources of energy, except geothermal, but I think you'll agree that sunlight is much more intuitive. Maybe it's not light they absorb, maybe it's some other radiation, but we'll assume it's light. No physics on this thread, please!
Plants get energy from the sun, mass from nutrients in the ground (probably from organic matter). The amount of energy they gain from photosynthesis is irrelevant, because this is directly related to the total energy in the ecosystem (even carnivores get energy indirectly from plants), and has no effect on compared two different food sources.
I read that leaves tend to arrange themselves in a Fibbonacci sequence to get the most possible sunlight; there may be a similar effect in 4D than we could calculate, and thus find useful information about the size and number of leaves.
There are a few parts of plants in 3D that we can categorise with respect to eating them. Leaves, bark, fruits/vegetables, and grains. Some plants breed by allowing animals to eat their seeds, then spit them out at a different location, which is why they evolved fruit to look and taste good. We can assume that the same thing could happen in 4D, so fruit is probably an option. Mmm... gongyl-shaped apple... Speaking of which, I once saw some fruit that some farmer had bred into a torus-shape.
I'm not sure about leaves, bark, and grains though. Clearly most animals eat leaves, and most don't eat bark, but I don't know exactly why. I'm not sure how to define them irrespective of the dimension, or how to decide whether they would exist in 4D. So I'll leave them for someone else.
Ok, I think that's enough. I'll let someone else have a turn now. I thought quite hard about this, and I think it's clear enough that the above words almost certainly have analogues in the 4th dimension. But if I've made assumption I shouldn't have, or if there's a good reason why they shouldn't exist, let me know, because I don't really know much about biology, just the basic stuff. There's probably completely new things I haven't thought of at all. There's still a lot of work for 4D biologists, but at least we're finally on a topic that we've been trying to discuss ever since the forum started.