Nylon ukulele strings are rather durable and are less susceptible to damage from oils and sweat than metal wound strings which are often found on guitars. How often you need to change your strings depends on how much you play it. This could be every other month to about every six months. Restring your strings, if they need it, well before performances as the string will stretch considerably when your uke is first strung.
A piece of toast with peanut butter. Peanut butter should not cause diarrhea. In fact, the Cleveland Clinic recommends adding peanut butter to your diet if you develop diarrhea. If you are allergic to peanuts, however, diarrhea may occur after you eat peanut butter.
A large bowl of yogurt on a table. Smooth, creamy yogurt not only makes a tasty snack, but it may help treat some types of diarrhea. While there isn't enough large-scale research to say for certain, some studies show that probiotics -- friendly bacteria -- in this dairy food may ease symptoms in certain cases.