Look up "weider in jelly", it's an energy-and-nutrient drink of sorts. He was also eating "calorie mate" bars in that frame.
Actual branding not depicted of course, but you can see the similarities in the shape of the packaging.
These sorts of products are stereotypical energy/nutritional supplement foods that workaholics are often shown eating in lieu of normal meals since they're compact, don't require cooking, don't create a mess or require significant cleanup, and are quick to eat.
Why would he think of patients or even have patients if he is a university pharmacology associate professor?
Well whatever. Maybe he meant patents. I suspect the Japanese terms for those words wouldn't be nearly so close together.
When do we get to the smexy white lady on the cover art?
He thinks to correct a girl who is praying to a god because of the patterns on his arm. But he just literally woke in a world that he isn’t from and in a body that isn’t his... and he thinks what?
Poor writing... Not to mention if he’s a pharmacist. He wouldn’t be doing research... He would be at a pharmacy.