Hello and welcome! Nutrition is sadly something very few people know a lot about, so that's a great choice for a subject to study. Even most doctors are completely clueless about it. We need more experts on nutrition, and being able to write well about the subject would be very helpful too.
Most of the health problems we have as a species are from poor diet choices. It's a real shame too how badly people are programmed. As you probably already know, it is very hard to get people to make even minor changes. A good example is a morbidly obese guy here at my work the other day said, in a shocked voice, how he had lost 10 pounds simply by cutting out soda.
Well, gee, you think?! I wanted to reply, "Well, duh." Instead I just nodded. I avoid table sugar as if it were poison by the way... because it is. haha
There are a ton of other webpages to help you with Steemit. Here are some of the best for beginners:
https://steemd.com/ (This site is used to keep track of your voting power and other stats. You do not want to run out of voting power, and you only get so much per day. I keep my voting power around 80% for example.)
https://steem.makerwannabe.com/ (This site will tell you who follows you, who unfollows you, and who mutes you. It is great for meeting new people too. I regularly check it to see who has followed me to see if I should follow them back.)
https://steemit.chat/ (This site is the official chat webpage for Steemit. There are Discord channels too, but I usually stick to the official site. Come in to network and meet new friends. You can directly message people there too, so it makes it easier to communicate with your closest friends.)
Oh yeah, there are a lot of bots on here. If you see a cookie cutter reply, especially to your intro post, it is almost certainly a bot. Check the account's reputation. If it is low, I would recommend just ignoring them. Everything is public on Steemit, so you can go look at an account's comments and replies. Are they all the same? It's a bot.
Again, welcome, and I've followed you! If you have any questions about getting started, look me up on the chat site.