Thank you both for your feedback!
Cecile - We have created a custom field for each of our 10 product groups, so I know which product groups people are interested in. The product interest token sounds great, but I'm not sure if it will work with our custom product group fields. If I could create a token that reads whether or not that custom product group field is true or false and then put in the necessary information that would be ideal.
Steven - I may be misunderstanding, but I'm not sure how your process will work for people who have interest in multiple product groups? If I'm making one email per product group (segment), it seems like with your process I would have to choose which product group's email I am sending to that lead (even if that lead had interest in multiple product groups). Otherwise, I would have to make an email for each combination of product group interest which is, unfortunately, unrealistic.