I think that chocolate and beef are needsed much more than water than, vegetables, fruits and grains.

I have learned this reality soAfter learning about this, I will change my eating habits.

I will continue to eat chocolates and beef but I wouldill try to eat less of those.

If I do that I supposed to get many good effects on not only my health but alsDoing this makes me healthier and allows me to contribute to society.

Second, almost all cocoa products are produced by foreign countries so we shouldneed to import them, but then it uses a lot of energy is needed to transportation so them, making it is one of the reasons that causes the global warming.

However if we stop eating chocolate, the there is a risk of inducing poverty foron foreign cocoa producers.

For these reasons aforementioned abovereasons, I will keep eating chocolate and beef but I decided to take care of the environment and not eat as I pleased.

I think that chocolate and beef are needsquire much more water than vegetables, fruits and grains.

賛成した！

I will continue to eat chocolates(s) and beef but I would like to try to eat less of those.

応援しています！

If I do that I am supposed to get many good effects on not only my health but also on society.

Second, almost all of the cocoa areis produced by foreign countries so we shouldneed to import ithem but then it uses a lot of energy tobecause of the transportation so itwhich is one of the reasons that causes the global warming.

However iIf we stop eating chocolate, however, there is athe risk of inducing poverty foron foreign cocoa producers.

We try to avoid starting a sentence with "however."

For these reasons mentioned above I will keep eating chocolate and beef but I decided to take care of the environment and not eat as I pleased.

また、

For these reasons I will keep eating chocolate and beef but I decided to take care of the environment and not eat as I please.

I think that chocolate and beef are needs much more water than vegetables, fruits and grains.

Be careful with verb conjugation

I haveSince I learned about this reality so I will, I decided to change my eating habits.

I will continue to eat chocolates and beef but I would try to eat less of those.

If I do that I supposed to get many good effects on not onlythink there will be many benefits for my health butand also for society.

Second, almost all cocoa areis produced by foreign countries so we shouldhave to import them but then it uses a lot of energy to transportation so it is one of the reason that causes the it. This excessive energy use is a contributor to global warming.

However if we stop eating chocolate, there is a risk of poverty for foreigncausing a lot of economic hardship for cocoa producers.

For these reasons mentioned above I will keep eating chocolate and beef but I decided to take care of environment and not eat as I pleasednot consume as much as I did before.

I thinkhave learned that chocolate and beef are needquires much more water thano produce compared to vegetables, fruits and grains.

I'm not sure if "think" is the right verb here. Do you mean that you have learned/found out this fact?

すみません、この文の意味はよく分かりません。何を伝えたいですか。

Since I have learned this reality sofact, I will change my eating habits (accordingly).

"Reality" is a bit strange here. I think "fact" is a bit more natural and has around the same meaning.

I will continue to eat chocolates and beef, but I wouldill (instead) try to eat less of those.

If I do that, I will supposed to get many good effects on not only my health but also societyly benefit not only my health but produce social/societal benefits.

"Benefit" is a way of saying "good effect." This allows the idea to be conveyed more concisely.

Second, almost all cocoa are produced by foreign countries so we should, which results in us importing them but then it uses. This then results in using a lot of energy to transportation, so it is one of the reason that causes theof global warming.

I fixed up the transitions here. I would also personally say it as "one of the contributing factors to global warming" at the end.

However, if we stop eating chocolate, there is a risk of poverty for foreign cocoa producers.

For these reasons mentioned above I will keep eating chocolate and beef, but I have decided to take care of the environment and not eat as I pleasedwill do my best to eat less.

I can't think of something that sounds natural that conveys a similar idea to "not eat as much as I please." Maybe "I will do my best to control my urges" or "I will eat less than I usually enjoy?" Maybe someone else can find a better phrasing for this.