Lena, avoiding sugar (and high potassium foods) are the mainstay of my diet:

MC Diet

As long as I follow this I don't even notice that I have myotonia. That's after severe stiffness earlier in my life. The only thing now that sets it off is exposure to pesticides and herbicides or medications that affect electrolytes.

I did find that taking the supplement Acetyl-L-Carnitine allowed me to tolerate a little sugar occasionally. It is often prescribed for diabetics because it helps with insulin resistance and peripheral neuropathy. You can get it at any health food store.

Jan

Type of Myotonia: Thomsen's

Country: US