Hello and welcome,
The ADA would typically dictate this situation and would require that the employer provide your husband with reasonable accommodations typically. It does not require that they provide him with the best accommodation or any that he requests, but if his condition may be controlled by a snack between meals and he directs the meetings, he should indicate to the participants that there will be "bathroom" or other breaks periodically, depending on the length of the meetings.
During such breaks, your husband could eat a snack he has brought or buy one from a vending machine.
In addition, if the emplioyer does not provide a meal time break, that would normally be a reasonable accommodation under the ADA.
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