Can I hide the calories of the foods in a patient's meal plan?

Yes. In the last step of the meal plan, Summary, look for the What the patient will see panel. It has a Show calories row with one switch for the App and another for the PDF:

• App: shows calories and macronutrients per day in the patient’s app. This setting is saved as the patient’s preference.
• PDF: shows the calories next to each food in the PDF. This setting applies only to this PDF.

Turn off the App switch, the PDF switch or both if you don’t want the patient to see calories.

This option doesn’t apply to free-text plans, because they don’t calculate calories.