can I create a report based on a form where clients report what they eat daily across 5 categories that shows a total/summary for the entire week

Hello,

Thank you for contacting us.

Of course, you can make that reports with JotForm, refer to this for futher help : 

http://www.jotform.com/help/187-How-to-Create-a-Visual-Report-with-your-Form-Submissions

Once you are there, click on the Filters icon, next, click on Add new filter  : 

Now click on Submission Date :

And select Current Week or if you want you can make your Custom Range : 

I hope that helps.

If you need further assistance, feel free to contact us.

Regards.