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It's not just adjustment, there's a decent amount of evidence it's just bad for your health in general, apart from the issues when coming back to earth. Stuff like your circulation also gets messed up.

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I'm active in this topic and have never heard anything similar to what you've mentioned. And in looking this up, there's a very recent study [1] that's quite relevant. They studied the cardiovascular health of astronauts for 5 years after their return from long-duration stays on the ISS. They were all perfectly healthy.

[1] - https://journals.physiology.org/doi/full/10.1152/japplphysio...

To expand on that - there are many body systems that depend almost entirely on the 1g glodilocks zone. Lymphatic systems movt , venous blood returning deox blood to the heart and even some digestive processes. Keenly dependent on a g value that allows proper muscle tone/function to the systems at play. Too little or too much and and human life becomes non-viable. Throw in the effect of ping ponging between microgravity and 1g and the issues multiply.

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