No matter what his grades are, his certificate is the same. In actual combat, we still rely on knowledge. Many low-level nutritionists are worse than high-level nutritionists! Knowledge is open, see if you are willing to pick it.
I have also come into contact with many beauty industries. Nowadays, beauticians are mostly beauticians, hairdressers, Chinese medicine hygienists and even beauty nutritionists. However, they all issue professional certificates, and the course content is quite good. It depends on which industry you choose in the future. If you continue the beauty industry, you can consider a beauty nutritionist. If you switch to the nutrition industry, then you can be a nutritionist.
Go to a nearby training school when you have time. If you have no time, you can go to online school at home. The advantage of nutrition online school is that it can be repeated. You are not afraid of not being able to keep up with the teacher's progress. The learning cycle is about half a year.
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I wish you success in your studies.