I’ve been on a Keto diet since 2014. That’s 8 years. I’m 74 years old and very active and healthy. My weight is 140 lbs (5′8″) which is what I weighed in high school.
For me it’s a way of life. Sometimes I indulge in non-keto food, such as organic fruit in season, and an occasional bowl of organic oat groats, but I start the day with a modified bulletproof coffee with an ounce of MCT oil and a teaspoon of grass fed butter to kick start my ketones.
I skip breakfast and have my first meal about 11 am or noonish. My usual daily diet consists of organic avocados, grass fed meat, organic green vegetables from my garden mostly, organic olive, mct, and avocado oils, grass fed butter, pasture farm eggs and bacon, and organic almonds. Whenever I indulge in carbohydrates as in fruit, grains, cranberries, blueberries, or other high carbohydrate foods, I make sure I eat just a small amount, and then I run to the bathroom and brush my teeth with hydrogen peroxide since carbs are so bad for the teeth and gums.
High carb foods are certainly tasty - I admit, but they are so bad for health except in small quantities. The problem is spiking insulin.
Good fats are so good for health and do not spike insulin. Protein in moderation. But excessive protein is not good, and spikes insulin too. Healthy fats from avocados, pasture meat, organic olive oil, pastured eggs are good and do not spike insulin.
You ask, how long can you stay on a keto diet safely? A better question would be, how long can you stay off a keto diet safely? The Standard American Diet is so bad for health. A truly health conscious person will eat keto and organic.
I was on a keto diet about 9 years but lately I’ve added some healthy carbs to my diet such as organic bananas, fruit, avocados, apples, etc. The reason is that while keto is great for getting healthy and losing weight, I actually lost too much weight and muscle. I’ve also started working out at a gym and adding more protein to my diet because I’m not happy with how much strength I’ve lost over the last decade.
I’m almost 76 now and that’s pretty normal I guess, but now I’m trying to get back some weight and some muscle. At 5′7, 135 lbs, I’m pretty skinny and need to get help sometimes lifting heavy things that previously I could lift myself.
Maybe I went a little overboard on the keto. But on the other hand, I always wanted to get rid of my pot belly and am very glad it’s long gone!!! Am very proud of my little “six-pack!”
A ketogenic diet is not a diet that you can whimfully choose to go on and off of at any point. It takes time for your body to adjust and go into a state known as ketosis.
This process? Anywhere from 2 – 7 days, depending on your body type, activity levels, and what you’re eating.
The fastest way to get into ketosis is to exercise on an empty stomach, restrict your carbohydrate intake to 20g or less per day, and be vigilant with your water intake.
I’m not sure by what mechanism ketosis will ruin your metabolism. That sounds like a scare tactic by people that want to sell processed foods and sugar. I’m about 5 years in now and feel great.
Everyone produces some amount of ketone bodies all day long. It’s part of your normal metabolic process. Your brain can run on 70% ketones and your body can make up the rest by making glucose form fat and protein. So your brain is fine.
You muscles can run largely on free fatty acid, ketones and glucose. So that’s fine.
In a study of extreme endurance athletes the one who followed a ketogenic diet restored their muscle glucose stores as quickly as the high carb athletes even though they weren’t eating any appreciable amount of carbohydrates.
This study rewrote the medical books on ketogenic diets and performance. Sugar burning athletes can use about a half a gram of fat per minute for fuel. Keto athletes can use a gram and half and can stay majority fat burning up to 70% of their VO2 max.
And can still burn fat up to 90% of their VO2 max. All of this was though to be impossible until 2018.
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