An incomplete list of things that I’ve
found interesting professionally:

Dog food
Cat food
Fast food
Pasta 
Soft drinks
Mobile phones
Fine dining
Casual dining
Fast food
Air travel
Hotels
Business software and payment technology
Paint
Lawn care
Winning baseball teams
Losing baseball teams
Bipolar Disorder
Medical devices
Outpatient surgery
Clinical trials
Publicly-funded park projects
Plant-based meat products
Amateur sporting events
Boots
Applesauce
Beer 
Stadium concessions
Car insurance
Breakfast cereal
Guilt-free snacks
Pet treats
Soy sauce
Whisky
Candy
Fresh frozen turkeys
Deli meats
Mushrooms
Walnuts and walnut farming
Milk and dairy farming
Cheese
Frozen pizza
Dog shows
Green beans
Blue jeans
Construction supplies
Surgical supplies
Neuroscience
Hospital safety
Heavy equipment manufacturing
Global logistics

An incomplete list of things I find interesting just for fun:

Bikes, bicycling, and bike repair
Active and public transit systems
Science facts and science fiction
Environmental justice
Sandwiches
Renewable energy
Whiskey
Home DIY
Toddlers/child psychology/big trucks and construction equipment