The only way is to download the report as a PDF, then send it from your email as an attachment.
The reason we do not allow users to send reports directly to clients from the software is security. Basically, if some attacker gained access to the outbound email servers and associated accounts that NutriAdmin uses, they would be able to read confidential information from all clients stored in the database.
Although it would be practical to send reports with a click from the software, this would expose several vulnerabilities, and violate several of the rules of HIPAA compliance.
The only emails NutriAdmin sends are reminders, appointments, and empty questionnaires (read here why clients are not allowed to save questionnaires mid-way through completion). The listed emails never contain confidential data, only empty forms, the first name of the client, etc.