Editing Glynis Johns (section)

===Health and voice===
Following her marriage to David Foster in 1952, she became {{convert|14|lb|kg|spell=in|round=0.5}} overweight. Talking to Lydia Lane, she describes this ordeal: "I was relaxed, happy, with little to do and I suppose I simply didn't burn up as much energy as usual. My appetite stayed the same and I gained a few pounds at a time until one day I discovered I was 14 pounds overweight." Her solution was simple: "I'm convinced that weight is a mental problem," she said. "I counted calories for a while, but nothing happened until I became really disturbed about it. From that moment on, I began to lose weight and in three weeks, I was back to normal. The point I am trying to make is that dieting alone is not enough. It must be accompanied by a strong will and determination to lose [weight]."<ref name="Vintage Venus">{{cite news |year=1955 |title= Glynis Johns – Beauty in classic Hollywood! |url=https://neglectedvenus.wordpress.com/2020/08/07/glynis-johns/ |work=Beauty in classic Hollywood! |access-date=19 October 2022}}</ref>

Johns previously had severe [[migraine]]s. In a 1955 interview, she admitted, "Only recently have I learned how to relax. And since I have, the migraine headaches, which have plagued me for years, have disappeared. I've finally learned to be still inside. Someone told me once, 'When you let God in on your problems, you can let go and relax,' and I've found that it works."<ref name="Vintage Venus"/>

A few days before Johns was due to play Desiree Armfeldt at the opening night of ''A Little Night Music'' in 1973, she was rushed to hospital for emergency treatment of an [[intestinal infection]]. The debut was postponed by a week and [[Tammy Grimes]] was thought to be a likely successor. Though her doctor was "aghast", Johns rejoined the show after just two days: "I was not going to have anybody else sing my songs," she said.<ref name="Johns Hits a High Note"/>

Johns suffered from [[stage fright]] throughout most of her career. In a 2023 interview, her grandson Thomas said, "Of course, she came across as supremely confident, but in private, she suffered quite crippling stage fright that she never really got over – only managed – so that makes her career even more remarkable."<ref name="Daily Express 2023"/>

Johns' voice has been described by a press agent as "like the sound of a brook burbling over a pebbled bed."<ref>{{cite news |last=Berg |first=Louis |date=2 August 1953 |title=I'm put together all wrong! |url=https://www.newspapers.com/clip/111919863/glynis-johns/ |work=[[St. Louis Globe-Democrat]] |location=Newspapers |access-date=30 December 2022}}</ref> In ''[[Finishing the Hat]]'' (2010), [[Stephen Sondheim]] wrote that she had a "small but silvery voice that was musical and smokily pure".<ref name="Finishing the Hat"/>