Mealworms are a descent fattening grub if used respectfully. The meat:shell ratio is not the best so you must be careful in the quantity that you are feeding due to them being hard for your beardie to digest and could cause them to vomit them up, impaction, or irritate their digestive tract.
Small beardies under 5 months old have a tiny kink in their digestive tract that eventually straightens out as they grow. But due to that kink (like one in a hose) its hard for them to pass hard things... not to mention the small size of their vent.
A 3-4 month old beardie should be fine as a treat to give 2 or 3 mealworms once a day... ONLY A COUPLE OF TIMES A WEEK. Just to monitor him/her as well. Making sure all basking temps are appropriate in order to aid in proper digestion as well.
It may sound over analyzed, but in the many years I have been breeding.... I can relay all of the medical info that Vets will tell you as well.
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sincerely,
ABD