Source: http://observer.com/2017/03/imbalanced-microbiota-gut-bacteria-weight-loss/
Not citing the source of photos(images) is plagiarism. Here is a post on why this is bad, and here is how easy it is to find allowed photos.
Creative Commons: If you are posting content under a Creative Commons license, please attribute and link according to the specific license. If you are posting content under CC0 or Public Domain please consider noting that at the end of your post.
Not indicating that the content you copy/paste is not your original work could be seen as plagiarism.
If you are actually the original author, please do reply to let us know!
"It's hard to understand complex licenses that is why all photos on Pexels are licensed under the Creative Commons Zero (CC0) license. This means the pictures are completely free to be used for any legal purpose.
The only restriction is that identifiable people may not appear in a bad light or in a way that they may find offensive, unless they give their consent.
The CC0 license was released by the non-profit organization Creative Commons (CC). Get more information about Creative Commons images and the license on the official license page."
This information was taken from pexels.com. The site you ref as source obtained the image from a different source and listed that source.
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Valid point.
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