Keto is ABSOLUTELY a sustainable long term diet. Better yet, call it a lifestyle. What's not sustainable is the first 2 weeks that some people do in the beginning of Keto with no carbs or sugars including fruits and vege's. Longer term there are guidelines for adding good wholesome carbs into the diet from sources like sweet potatoes. One thing to remember with Keto, to keep it sustainable long term, is to eat good healthy fats. A lot of trans fats like removing the bun from your big mac!, is not a good long term play!!!! Choose lean, organic meats, nuts and seeds, and natural peanut butter, etc. Eat lots of vege's and fruits! There are plenty of people who do this long term that compete in Ironman triathlons! It took me almost a year to reap the benefits of it, and exercise sessions more than an hour at first really lacked energy. After a year, I had more energy, feel amazing, and I could do fasted 80% threshold bike rides for 3 hours at a time before I needed to fuel my body at all.
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