Keto is not only for obese people. You have that perception because it has been packaged and marketed as the Atkins Diet. There are a number of attractive aspects of this diet that map well to an obese audience who have probably had a terrible time w/ diets / have negative perception of diets and their success as well as "fear" of the impact on their current lifestyles and ability to succeed at it. These include:
- when you drop carbs from your diet, you also see a dramatic drop in weight fairly quickly (due to water - NOT fat), which helps w/ the frustration aspect of trying to see some results quickly.
- from a "lifestyle change" to make this diet reasonably easy to follow - I think people find it easy to adopt and doesn't require that they starve (which is usually the biggest perceived "scarey" part of dieting.)
- very simply putting many of these people on a structured diet where they are more aware of their portions, will produce some sort of result, regardless of keto or otherwise.
- removing the large category of carb-foods from a diet helps to remove those foods that are high in sugar which allows the person to start weaning themselves off of their body's sugar addicition - thus also removing sugar spiking -> cortisol spiking.
- from a health standpoint, it is becoming well-documented that a keto-style diet works very well for diabetes patients, and Type 2 (Adult) Diabetes is a common "side effect" of obesity.
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Study - keto diet may reverse kidney failure
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A low-carbohydrate, ketogenic diet to treat type 2 diabetes
On the other side, the problem w/ people's naive perception of keto diets is the only part they pick up on is the "low/no carb" thing - but then don't understand that the carbs have to be < 20 g (or so) to actually switch over to ketones - and if you're not going low enough (e.g. 30 g) but staying at that level you're not helping yourself because you've left yourself w/ not enough energy source to do anything except stall out your metabolism.
I know a number of people who follow a keto-style diet for both bulking and cutting for competition, including myself. As Built has noted many times in her discussions, she tends to work better w/ a preference for fats over carbs, so I believe there are some people who actually do work better w/ fats over carbs. But you have to manage how much and if you're cutting, you also need to manage the total cals you're getting. People often use keto when they have an agressive target competition schedule and need to lose flab, but in focusing on dumping fat aggressively (i.e w/ more restricted cals) I've found that keto can produce more muscle loss.