Jan18 wrote:I've been trying to institute a ketogenic diet, but keep reading conflicting information -- it's healthy vs it's not healthy, it's safe vs it's dangerous, it's extremely hard to follow. My head is swimming.
First let me reiterate what Stavia said,
Stavia wrote:you cant go wrong by following Gundry's list if you want exact guidelines.
Second, with regard to if a Ketogenic diet is healthy or not healthy, safe or dangerous.:
A ketogenic diet is generally healthy, safe, and
especially beneficial for ApoE4s. A typical criticism I hear of ketogenic diets is the long term effects are unknown. I read this to mean there are no clinical trials, but I say we do know long term effects, it’s called human history. For most of the history of man, we went through periods of little/no food. Only in recent years have humans had virtually unlimited food quantities available and only since the nutritional guidelines for Americans changed in 1980 have carbohydrates come into prominent consumption. The body’s ability to switch to using ketones for energy was an adaptive coping mechanism to maintain physical ability and mental clarity during times of food paucity, it enabled man to survive.
There are many reasons to pursue a ketogenic diet – to lose weight, to fight cancer, to address diabetes, to improve athletic performance etc. Dr Dom D’Agostino has been working with the military and NASA to use the neuroprotective qualities of ketone therapy in severe environments (space, undersea diving.). But each of those strategies have unique nuances, a ketogenic diet for a cancer patient, where the objective is a fairly deep level of ketosis is different than a ketogenic diet for an ApoE4 trying to maintain cognitive health.
Dr Bredesen recommends mild ketosis for cognitive function. Beta-hydroxybutyrate (BHB) is the ketone body that increases Brain Derived Neurotrophic Factor (BDNF), an important neuron and synapse supporting molecule. He recommends this through a low-carb diet (insert Dr Gundry's diet here), exercise, fasting at least 12 hours, and consuming certain fats.
One of the other criticisms of a ketogenic diet is ketoacidosis. Ketoacidosis is a metabolic state associated with high concentrations of ketone bodies accompanied by high levels of glucose. This is dangerous because typically there’s a balance between these two, i.e. if high glucose, there should low to no ketones, or if high ketones there should be low glucose. If both are high, blood becomes very acidic, this is an unnatural state for the body and is dangerous. The three main causes of ketoacidosis are alcoholism, starvation, and Type 1 diabetes. Exclusive of those conditions, it is not a potential side effect of following a mildly ketogenic diet, so this is a largely invalid criticism.
The Atkins Diet has been cited as a ketogenic diet, which has also shed a negative light on ketogenic diets, but there are many caveats to consider here. First, the intention of this diet was weight loss, not metabolic or cognitive health. Secondly, followers of the diet tended to consume too much animal protein and not include vegetables. There was also no guidance with regard to food quality, followers consumed large quantities of grainfed beef, hormone laden chicken, A1 casein dairy, and refined vegetable oils. On top of that, Atkins products that were sold were processed foods with artificial sweeteners. (These are all areas Dr Gundry addresses in his book.) So the Atkins diet was often highly inflammatory.
With mild ketosis, a person is not necessarily burning ketones all the time, but has developed “metabolic flexibility” to use glucose or ketone bodies for energy. This is especially critical for the brain. The brain is an energy hog, it uses about 20% to 30% of the body’s total energy needs. There is a significant link between Alzheimer’s and impaired brain fuel metabolism. When people follow a carb-dominant diet the brain uses glucose for fuel and is
only able to use glucose, it has no alternate source of energy, resulting in cognitive issues. But after becoming “fat adapted” through ketosis, a process that can take weeks maybe even months, the ketone “fuel tank” becomes accessible making the energy hungry brain happy.
Followed properly, a ketogenic diet offers a many health advantages beyond cognitive benefits, entire books have been written on this. So safe and healthy? I say yes.