Sometimes enuresis (involuntary urination at night) can be caused by
diabetes or constipation, both of which are influenced if not caused
in part by diet. This is in part because bed wetting happens when the
bladder gets too full, but the person doesn't wake up until after the
bladder has released its contents. Diabetics may need to pee more
often; constipation can physically reduce the amount of space
available for the bladder to expand. Diet can also influence the
amount of urine that the body produces, and some foods may irritate
the bladder and make it less able to hold and control as much urine.
It would depend on what the child eats, rather than strictly when he
eats it (though eating/drinking right before bed clearly has an
influence on what happens later that night). I'd suggest he avoid
stimulant foods (caffeine, chocolate), dairy, and foods that cause gas
or constipation. It's a good idea in particular to avoid drinking a
lot right before going to bed. I've also seen a suggestion that
children avoid citrus right before bedtime, since the citric acid
might irritate the bladder.
However, from what I've read diet has a small influence on bedwetting,
particularly in teens. You should talk to his pediatrician (or better
yet, let him do it so he doesn't feel weird about you doing it) at his
next appointment. If it's bothering him, make a special appointment
to see the doctor. Your son will have his urine tested to see if
there's a medical/physical reason for the enuresis, and his
pediatrician will also try to see if there might be other reasons. If
nothing else you can get the advice of a medical professional familiar
with your son's history (which, as per the Google guidelines, I am not
See the below websites for information:
TeensHealth: Bedwetting (Nocturnal Enuresis)
"It may help to avoid eating certain foods in the evening: Foods that
can irritate the bladder include coffee, tea, chocolate, and sodas or
other carbonated beverages containing caffeine. And some people find
that avoiding dairy foods at night may prevent the deep sleep that can
contribute to enuresis."
National Kidney and Urologic Diseases Clearinghouse: Urinary
Incontinence in Children
Some of the same factors that contribute to nighttime incontinence may
act together with infrequent voiding to produce daytime incontinence.
These factors include
- small bladder capacity
- structural problems
- anxiety-causing events
- pressure from a hard bowel movement (constipation)
- drinks or foods that contain caffeine, which increases urine output
and may also cause spasms of the bladder muscle, or other ingredients
to which the child may have an allergic reaction, such as chocolate or
Sometimes overly strenuous toilet training may make the child unable
to relax the sphincter and the pelvic floor to completely empty the
bladder. Retaining urine (incomplete emptying) sets the stage for
urinary tract infections."
Medformation.com: Bed-Wetting (Enuresis) For Teenagers
"Decrease evening fluids. Normal fluid intake is fine, but try not to
drink excessive fluids during the 2 hours before bedtime. Especially
avoid beverages that contain caffeine because caffeine increases urine
production. Remember: Everything you drink eventually becomes urine.
During the day, however, drink all you want. Decrease evening fluids.
Normal fluid intake is fine, but try not to drink excessive fluids
during the 2 hours before bedtime. Especially avoid beverages that
contain caffeine because caffeine increases urine production.
Remember: Everything you drink eventually becomes urine. During the
day, however, drink all you want."
To find this information and these links, I first went to the
Medlineplus Health Topics page for Toilet Training and Bedwetting
and browsed through the links. Then I searched Google for "teenager
enuresis" to get some more of the above. I hope this helps you,
please feel free to ask for clarifications if I can help further!