Reading aloud helps you to catch typos, word omissions, repetitive phrases, awkward sentence construction, etc.
When I edit, I ALWAYS read the text aloud. I wouldn’t catch half the mistakes I find without reading aloud.
I also find that reading aloud as I write helps me to develop smoother sounding sentences from the very beginning. I even read my text messages and emails aloud to ensure I’ve written what I mean to say in the most professional manner possible. There's nothing worse than noticing a typo after you've sent the email...
Reading aloud can be a little embarrassing, which is why I prefer to be completely alone in my office when I write or edit. If you want to become a better writer, I would suggest you find a quiet place where you can be alone and feel comfortable reading your work aloud. As you read, you’ll notice missing words and abrupt transitions. Stop and fix them before you continue on.
It really is as simple as that. You can dramatically improve your writing by simply reading it aloud as you edit. Try it and see the difference.
If you would like to learn more writing tips and tricks, check out my PowerPoint presentation An Introduction to Writing in Science, available in ebook format on the Amazon Kindle app.