[0] even this is debatable
I was reading about how back in the day original coffee houses were a meeting place for socialites and thinkers alike to share ideas. I’d love to see that sense of community nowadays,I feel like it’s missing in the US and would be celebrated, but maybe it’s just my nerdy idealization.
Some still are in Europe at least. But they're closing down here as victims of modern lifestyles. We had (until the 80s) 4-5 cafes here where everybody who was everybody in culture frequented -- including different generations (20+ to 70+ year old people).
Some problems:
1) real estate prices in city center makes it impossible to keep renting for such a purpose or (if the cafe owner also owns the building) more profitable to sell the place and have it be made into a clothes shop or similar.
2) rising rents or (in other cases) deterioration of city centers, means that many intellectuals, playwrights, musicians, writers, academics, etc chose to move in other neighbours, which makes it more difficult (especially with added traffic) to frequent the same city center cafe anymore.
3) some owners just die and their kids are either clueless and turn the place into some "trendy" BS losing the clientele, or want to sell it and move on, or they simply don't have kids to pass it on, and nobody gets the legacy they've created (though sometimes new people step it who respect the original vision -- sometimes even after a few years of the shop being closed).
A "restaurant for fasters" is called "buffet": fasters need to eat a lot in between their fasts (assuming that fasts are frequent).
I think I just saw an ad for an app on YouTube that is supposed to help you with fasting. You could market zero-calorie electrolyte tablets, or break-fast bars / tubes / whatever to give you the optimal recovery to "non-fast" mode. You could market protein or vitamin supplements to counter the fact that you're getting 2/3 or 1/3 of the nutrients, but probably still requiring the same amount of some nutrients.
I think there's lots of opportunity for the creative to make money from this fad. :-)
I think the Abrahamic religions figured it out already...you create holy days like Yom Kippur, Lent, Ramadan and make fasting a mainstay of the traditions. Boom, not only can you make money on not eating, but you can simultaneously take credit for all the actual benefits of the fast itself.
Martin Berkhan created a very lucrative coaching platform with Intermittent Fasting: https://leangains.com/
Many books have been written on IF for profit:
https://www.amazon.com/Complete-Guide-Fasting-Intermittent-A...
https://www.amazon.com/Eat-Stop-Brad-Pilon/dp/177511080X/ref...
And countless others.
Taking your example, Lean Gains is a niche application for men trying to improve their physique, and it includes exercise and motivational components. This is pretty different to the Atkins diet for example, where the book is the diet, and they don’t really exist independently.
You can probably also up sell your products if you detect your customer is not playing his A-game. A hungry mind will typically explore less options and be more prone to risky behavior. It's probably something inherited from thousands of years of evolution, when you are hungry and there is a potential reward you take more chances, you don't think and you go get it.
I like OP's point, this diet works and it can't be sold to people en-mass which causes confusion when different retailers put their own little spin on things. Most fad diets are confusing, hard to follow, and sold to you. IF is none of those things.
I’m already seeing ads on Instagram for an app that’ll tell me exactly when to fast.
Also I use an app that allows restaurants to offer me discounts for eating at unusual times, and it’s big in the city I live in.