From what I know, this isn't true. Nutritionally, the only thing you need to avoid is high-protein diets. You can exercise just fine after a 6 week recovery period.

Of course, it's impossible to predict complications. Some donors have died on the operating table. The risk of complication is very low, though.

If you have any other questions I'm happy to answer.

Sources

* https://www.livingdonorgames.org/

* https://www.kidneyregistry.org/for-donors/kidney-donation-bl...

* https://www.kidneyregistry.org/for-donors/i-want-to-learn-mo...