I am a vegetarian for a week, I am only 16 years old. What adverse consequences await me in the future if I do not eat meat?

You may not have children. And you can have problems with the female sex on the basis of sex. Animal protein is essential for humans. especially during the formative period. Leo Tolstoy, who introduced this fashion, what time did he become a vegetarian? Think about it.

It is important what you eat, giving up meat. If baked goods, convenience foods, and junk food, there will be problems. There will be no problems if you get enough nutrients (BZhU), fiber, vitamins, micro- and macroelements with food and with supplements such as dietary supplements. Look at the daily allowance and try to stick to it. Pay special attention to the abundance of protein and iron. If you are afraid for your health, donate blood for tests every six months or a year, monitor the condition of your skin, hair and nails.

I also stopped eating meat at the age of 15-16. The only thing that the pediatrician told me (!) Was to replace meat protein with eggs, milk and legumes, nuts, seeds. She said to eat foods containing iron (apples, buckwheat, pomegranates), and to drink Sorbifer Durules (which I don't drink, by the way, hemoglobin is normal).

I am a vegetarian for 9 years, I feel no worse than before giving up meat. My fellow vegetarians don't complain either. So don't listen to scarecrows, if you want to be a vegetarian, be. It's better than making a deal with your conscience.

I don’t know about 16 years old. I save on meat from about 25 to 50 years old.

I used to shift tons of materials at factories and construction sites. I don't see any adverse consequences

The question was asked by an opponent of vegetarianism (parent?). Lifestyle changes happen in anticipation of improvements, and people who make changes ask about them.
When 70-year-old George Bernard Shaw was once asked how he felt on a vegetarian diet, he replied: “Great! Only the doctors bother me so much. who always say that I will die without meat! "
When, 20 years later, he was asked the same question about his present state of health, he exclaimed:" Excellent! Now, all those doctors who unanimously claimed that I would die if I don’t eat meat, they themselves have long since died, so now no one bothers me! "

I cannot refer to authoritative sources on this issue, but I can share my experience.
If you wisely approach vegetarianism and deliberately replace in your diet all the elements that you stopped getting with meat (eating legumes, drinking vitamins, etc.), then you can live like this and not grieve.
But I was 12 and I just stopped eating meat for 2 years. Bottom line: severe anemia, I was very pale, with bluish lips, I ended up with all starting breathing problems - at that moment I had to complete my vegetarianism. Besides. I haven't really grown up anymore and have remained the lowest in the family, but I won't insist that this is connected :)
Another feature that has remained with me to this day is an increased sensitivity to smells. Therefore, it was very difficult to start eating meat again, it seemed terribly smelly. Therefore, for several years after that, she ate only chicken.
Nevertheless, I know many people who have not eaten meat for years (or even decades!) and feel great, even give birth to children. So good luck and watch your health!

The only significant problem that threatens you in the future will be vitamin B12 deficiency, since it is completely absent in plant tissues. Because it accumulates very efficiently in the liver, symptoms do not appear until 3-5 years after B12 sources are completely cut off. You can read specific symptoms in pathophysiology textbooks (for example, Novitsky), and biochemical function is normal in biochemistry textbooks (for example, Leninger). Thus, vegans should very carefully monitor the intake of vitamin B12 in the body and accompany their diet with vitamin supplements or herbal products enriched with cyanocobalamin, which, frankly, is not a big problem in the 21st century in civilized countries.

Some may cite as an argument against switching to plant foods that plant proteins are not absorbed, and vegans develop amino acid deficiencies. This issue can be analyzed in more detail in the same textbooks on biochemistry, but it is worth mentioning, perhaps, only that the proteins of plants and proteins of animals really differ, but only in the quantitative ratio of amino acids: in humans and animals there are more amino acids in proteins than there are fewer plants, and vice versa - accordingly, to meet the needs, you need to eat a larger mass of plant proteins than animals, and at the same time a fairly large part of the protein will not be absorbed at all due to the excess of little needed amino acids. But in general, this is not a problem.

Here you can read vegan recommendations for vegans about health and about adequate selection of the right diet and competent replenishment of all missing substances.

low blood pressure, chronic fatigue syndrome, sleep disturbance, depression, panic attacks, weak potency, problems with memory and learning, a strong weakening of the immune system. Well, the rest - so, on the little things - exacerbation of chronic diseases, the development of allergic reactions ... In short, it will not be boring.