Nutrition and a healthy lifestyle 3

But of course you can go too far when it comes to healthy diet. Are there any people among you who have ever counted calories for a longer period l(this sounds odd, sounds better to say "longer than X number of weeks/months" or "months/years?"? I mean meticulously (this beginning phrase 'I mean meticulously' is correct if spoken english, as during a speech, but written it is technically not grammatically correct), writing down all the calories of all that you ate throughout the day and then had a look at the end of the day, how much it was in total then totaling it all up at the end of the day? Maybe some of you did that; maybe you did it secretly for a while; maybe you were even quite open about it. (In english it is very common to list things out in lists of threes when trying to drive a point home. Typically when we do this we place slightly more emphasis on the last statement. Nothing grammatically wrong, just a tip on sounding natural). 
That is what I did before the setback that I told you about, and what I would like to say to you now is: Do not be so hard on yourself. A healthy diet and a healthy lifestyle with exercise and sports, that does not have to be involve high mathematics, no constant calorie-counting calories and the feeling that it is does not working out the way you want it to be to, that you did notdon’t reach your daily goal. It doesn’t have to be involve a constant checking/looking at how many minutes you were able to lift weights or how many minutes you were able to spend on an exercise machine; no constant paying attention to fats, proteins and carbohydrates. (like I said before, if this is a speech it sounds great. However, if this is intended for a written audience, you should pay careful attention to these run-on sentences). Of course, it is important to pay attention to a healthy diet, but at some point, people face their limits. That should also be the key message of my short lecture: You cannot expect to always do everything perfectly. You must not constantly claim strive for perfectionism from yourself. And it's impossible to always pay close attention to everything, because that way, you only bring down yourself. That is by no means what we want to achieve. 
(didn't have enough space to finish the rest) good luck with your speech! (Those should be 'these' in your last paragraph). Also sounds a little odd to be saying, I'm coming to a conclusion now). Overall, great job, I've looked over native speakers who would have struggled to write as well as you did.