Is the Keto Diet Bad For You? Weight Loss, Health, Safety.
Are you thinking about following the keto diet plan? Is the Keto diet good or bad for you?
So many opinions are shared online. One friend follows the keto diet with success while another one brags about a high carb diet and their health benefits.
So what should you believe?
I started my weight loss journey with the 21 day fix diet (portion control) followed by a whole food vegan diet. During my weight loss journey I realized that you really can lose weight on different diets, but one question remained:
What is the healthiest of all diets?
As I discovered more and more people following the keto diet, I knew it was time to start thorough research. Before you read on I would like to emphasize that the purpose of this article is not to battle about Keto vs. Vegan, or low carb vs. high carb with only my opinions. The choice to eat any food is yours alone. I just want to provide detailed science and research for you to make an informed decision.
Scientific research has been around for almost 100 years showing the effects of (high) fat and carbs for health and weight loss. I would like to give you a clear understanding of what science has shown concerning health and weight, so be sure to read all the provided studies for yourself before believing any online influencer and/or popular media sites.
What is the Keto Diet?
The macronutrient ratio in the Keto diet is about 70% or more from fat, 20% protein, and 5-10% carbs. It is a low carb, high fat diet.
The theory behind this approach is that after cutting out carbohydrates, your body relies on the fat storage in your body to burn for energy. The byproduct of burning that fat are ketones, therefore your body is in a state of ketosis.
Why do people choose the Keto diet for weight loss?
A diet where you can eat cheese and bacon and lose weight does sound appealing to a large group of people. Thinking about reaching ketosis to melt all that fat on your body makes sense for many.
But is this even true?
Many people have tried the ketogenic diet, reached ketosis, and lost weight. But here is where I have to disappoint you if you are thinking about trying the keto diet for weight loss or for getting healthier:
Concerning weight loss the Keto diet doesn’t perform any better than other diets (weight watchers, portion control, Atkins,..). Concerning your health and safety, Ketosis is a terrible state to be in.
The Danger of Ketosis
If you are in ketosis your body is depleted of carbs, therefore burning fat for energy. Here is how your body should work:
Carbohydrates are made (by the plant) from carbon and water so when we eat the plants and burn the carbohydrates they break back down into water and carbon fueling us with energy in the process. It is easy for our body to “shed” these byproducts (breathe the carbon out).
Sounds like a natural process, as if our bodies were made to process carbs, right?
Therefore, carbs are our body’s preferred source of fuel. However, our body is also capable of using fat for energy in case of emergency (secondary energy source). We can burn fat to get energy but in a more complicated way. The byproduct from burning fat (during ketosis) are acidic ketones that our body then has to get rid of. The body also loses a lot of water because it needs to flush out those toxic ketones. That is also the reason why people experience bad breath, smell funny during the keto diet (toxic by product), and have to drink lots of water. You risk diabetic ketoacidosis as a result of your body switching to fat as an energy source:
“Diabetic ketoacidosis is a serious complication of diabetes that occurs when your body produces high levels of blood acids called ketones.”(source)
So, during ketosis you trick your body into a fasting (or starving) state, but it is also a sick state to be in (for example, cows die when they are in ketosis).
The acid that comes with these ketones is actually very bad for your body. It can destroy bone mass and cause kidney stones. Even children experienced kidney stones while on a keto diet (source).
Your brain suffers
Some keto dieters call it the “keto flu” when you feel dizzy, nauseous, unfocused or energy deprived during the keto diet. Well, your brain’s preferred fuel for energy is glucose (from carbohydrates). However this study shows that the produced ketones during starvation can fuel up to 2/3 of a starving brain, and the rest has to be glucose (which can be converted from fat and protein)
This might be one of the reasons why you have brain fog during the ketogenic diet.
High Fat Diet and Diabetes
The accumulation of fat inside your muscle cells interfere with the action of insulin, meaning that insulin is not able to bring the sugar out of your blood and into your muscles for use as energy (insulin resistance)(source). High insulin levels are associated with diabetes, acne, heart disease, and more.
Of course, high sugar makes this situation worse, but clogging your arteries with (saturated) fat will inhibit your insulin from doing its job in the first place. A study done by Sweeney in 1927 (Sweeney js. Dietary factors that influence the dextrose tolerance test. Arch Intern Med. 1927) shows the insulin resistance levels when given dextrose twice in one hour on each diet.
Clearly the high fat diet showed most insulin resistance levels and the carbohydrate diet had the least spike and levels over time.
The same study also showed an interesting correlation: The higher the fat and lower the carb, the higher the blood sugar spike (see below).
Just to back up these findings: Another research group infused fat into individuals’ bloodstream and insulin resistance increased significantly (source).
Now what happens if you lower the fat in the blood?
The sugar in the blood as well as insulin resistance lowers immediately:
“We conclude that lowering of elevated plasma FFA levels can reduce insulin resistance/hyperinsulinemia and improve oral glucose tolerance in lean and obese nondiabetic subjects and in obese patients with type 2 diabetes.” (source)
In a 1997 study, scientists tested the insulin response between an apple, 1 cup of oatmeal, 1 1/2 cup white flour pasta, a bunless burger (with no carbs), and 1/2 salmon filet. Turns out the meat had the highest insulin response!
Keto Diet and Weight Loss Success
There is no denying that you can lose weight on the Keto diet. Matter of fact you can lose weight on ANY diet as long as you maintain a calorie deficit. The positive part of the Keto diet is that it avoids junk food and sugar. And, of course if you eat less calories than you burn, you lose weight no matter if you are on the weight watchers diet, vegan diet, no pizza diet, no soda diet, you name it.
So if you only need to create a caloric deficit to lose weight, you might as well pick the healthiest diet out there.
Another huge weight loss mistake is following fad diets like the keto diet. Even if you decide to go keto for only 30 days, what happens after?
This study showed that the body fat lost during the keto diet slowed compared to the high carb diet and weight loss was occuring on fat-free mass (water, muscle,.). So when you stop the Keto diet after a while you will most likely gain the water weight back!
Turns out a high carb, low fat diet performs better for losing fat. That’s what you want to lose: fat, not your organ mass, muscles, and water.
“In a recent study, restricting dietary fat led to body fat loss at a rate 68 percent higher than cutting the same number of carbohydrate calories when adults with obesity ate strictly controlled diets.” (source)
If you compare an omnivore diet (with saturated fat) to a vegan diet without the saturated fat (from animals) you can see in this study that cholesterol levels were the best in the vegan group and the worst on the omnivore group. There wasn’t a high fat keto group, but I can only imagine the cholesterol levels would be even worse.
So let’s check another study (done by the Children’s Hospital Oakland Research Institute, Oakland, California): 53 men and women were split into two groups. One group consumed a high saturated fat diet, and the other group consumed a low saturated fat diet. And the result?
“As expected, total-cholesterol (11.0; 6.5 to 15.7 vs. -5.7; -9.4 to -1.8; p<0.0001) and LDL-cholesterol (16.7; 7.9 to 26.2 vs. -8.7; -15.4 to -1.4; p = 0.0001) also increased with increased saturated fat intake.” (source)
The keto diet was actually used to decrease frequency of seizures from epilepsy. What isn’t shared regularly is that 2 CHILDREN died from selenium deficiency and heart rhythm disorder (read evidence here). Another 9-year old child suffered acute pancreatitis while on the keto diet and then had a heart attack and died (source).
Furthermore 20 patients on the ketogenic diet were tested. 3 patients experienced heart rhythm disorder and 3 other patients experienced enlarged hearts.
“One patient with severe dilated cardiomyopathy and prolonged QTc normalized when the diet was discontinued.”(source)
Even if you compare fit people, this study of athletes found a lower blood pressure in vegan athletes than meat eating athletes.
Also consider that over half an egg a day increased heart disease risk between 6 and 40 percent, and 29 percent risk of diabetes (source).
Alternatively, daily consumption of 3 portions of whole-grain foods can significantly reduce cardiovascular disease risk in middle-aged people mainly through blood pressure-lowering mechanisms (source). The result is nearly the same benefits from symptom reducing drugs (but without side effects).
In fact, people who consumed 3-5 servings of whole grains a day had a ~26% lower risk of type 2 diabetes, ~21% lower risk of cardiovascular disease, and consistently less weight gain during 8-13 years. (source)
If the keto diet is not safe or healthy why does it work?
I hope that, by now, you read all the scientific evidence proving the point that high fat consumption and the keto diet is not healthy at all.
You can, however, lose weight on it because you run a caloric deficit and you cut processed food out of your diet. You could potentially see improvements in diabetes because of weight loss results, but not because the diet is healthy. In general, weight loss will help with blood sugar issues.
Losing weight is more than just following a specific fad diet. It is about finding a healthy lifestyle that is sustainable for the rest of your life. Only then weight loss will be successful: creating lasting healthy habits.
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