Who feeds really well rarely need supplements. When they do, it's most often for short periods of time, i.e. to achieve specific goals related to health, body composition, productivity, longevity and so on.
However, I know very few people who eat really well, In addition to eating every 3 hours (as I learned), this means eating at least 5 portions of fruit, vegetables or legumes a day, eating dishes with different colors of food, varying the menu periodically, among other things.
In other words, let's be practical: the ideal is to always seek good, constant nutritional advice (really competent advice; there are a lot of professionals out there spreading misinformation and passing themselves off as experts on the subject). Eating better and better should be a constant goal, but the truth is that most of us spend a lifetime without achieving absolute success in this regard!
However, while we agree that most of us don't really eat well, it's essential to understand that our bodies still have absolute, daily demands for water and various nutrients (vitamins, minerals, proteins, fats, etc.). If these nutrients don't come from food, they necessarily have to come from somewhere else, right? It is precisely in this context that the need for supplementation arises for most people: either you eat really well or you will certainly need supplements to provide the body with what it needs to function properly, but which is not being supplied by nutrition; simple as that.
But if you don't supplement correctly, you could run into problems. Correct supplementation ALWAYS means: choosing the right supplement for each case, in the right quantity, of good quality, with the right dosage, for the right period and for the right person. In other words, if you're not a competent health professional in this area, with experience and plenty of up-to-date study, it's very likely that you won't get all these variables right, making your supplementation ineffective, completely ineffective or even harmful.
For example, multivitamins and polyminerals: those available on the domestic market generally contain “everything”, but in clinically insufficient quantities and with “not so good” quality raw materials (https://icaro.med.br/polivitaminicos). As for the imported ones, there are several of excellent quality (I really like the ones from Optimum, GNC and LifeExtension), but they can cause “excesses” in the body, depending on the particularities of each case. Remember that an excess of some nutrients can interfere with the absorption of others (for example, sodium can reduce calcium, and iron can affect magnesium, among others).
In other words: when you use a multivitamin or multimineral supplement regularly, you also need to be monitored continuously to adjust its use to your body's needs. Otherwise, what was beneficial can become harmful.
In fact, the same principle applies to any and all supplements. It is essential to remember that those who use supplements need regular monitoring to ensure: “the right supplement for each case, in the right quantity, of good quality, in the right dosage, for the right period and for the right person”.
In short: either you eat really well, You will either need to take supplements under good and regular nutritional supervision. In this case, the use of supplements should be prescribed and regularly monitored by a health professional who is competent in the area of supplementation, with abundant and up-to-date experience and knowledge. If you neglect this advice, you are very likely to end up with unsatisfactory results or even intoxication in the short, medium or long term.
Doesn't that sound logical? That's right... It's as simple as that.



