Bulletproof coffee has an appreciable amount of fat from the butter or ghee, so make sure you count the macros from this cup of coffee for your daily food. 23g of fat per oz of ghee (2 tbsp).
Green Tea, and more specifically the catechins, have a minor effect on fat burning and oxidation. While there are numerous benefits, the affects are all minor with a range of studies backing up that claim (available in the links).
Caffeine can be good when used appropriately
Nate Winkler had a good article on PR Smashing Nutrition which covered the use of caffeine.
- Caffeine stimulates the sympathetic nervous system (the fight or flight instinct)
- Making use of the stimulant when you are training is good, however when you are not it can be bad
- Caffeine abuse reduces your sensitivity to the caffeine. This means higher doses are required for the same effect.
Based on that article, I cut my caffeine down to one 16 oz of coffee per day. I find that I'm plenty stimulated by that one cup now, where before I would need several cups throughout the day. When I get within a month competition I'll drop even that amount of coffee and not have any until the day of competition.
The combination of Bulletproof Coffee and Green Tea
I couldn't find any stats on how much caffeine was in the Bulletproof Upgraded coffee, but I did find some general stats on coffee and tea.
- 8oz drip coffee has 90-200mg caffeine
- 8oz green tea has 24-40mg caffeine
Green tea does have caffeine, but not so much as to be particularly worrisome. However coffee does have a lot of caffeine. If we use the 16oz threshold from my personal experience, we'd be looking at 180-400mg caffeine daily.
The equivalent mix would be 3-4 cups of green tea and one cup of bulletproof coffee. I would save the coffee as a pre-workout, and use the green tea throughout the day as you see fit. The important thing is that you don't overdo it, and scale back when you need to. I'm in excess of 250 lbs at the moment, so you may have to scale the total caffeine intake to account for differences in body mass.
Long story short, you should be fine.