Ketogenic diets are very, very powerful, metabolically speaking and this is especially important if you take any kind of medication for blood pressure, diabetes, cholesterol or triglycerides. The amount taken of these medications will most likely need to be sharply reduced while on a ketogenic diet to avoid negative effects such as excessively low blood sugar or blood pressure.
The ketone bodies are possibly anticonvulsant; in animal models, acetoacetate and acetone protect against seizures. The ketogenic diet results in adaptive changes to brain energy metabolism that increase the energy reserves; ketone bodies are a more efficient fuel than glucose, and the number of mitochondria is increased. This may help the neurons to remain stable in the face of increased energy demand during a seizure, and may confer a neuroprotective effect.[55]
I should note that I fully believe the key to success on a keto diet is to be prepared.  If you precook your meals, you are setting yourself up for success.  You are only choosing to do keto once a week when you prepare your food. If you have no keto food at your house and its 9 pm on a Wednesday, then you are just asking to revert back to something easy like chinese food or pizza.  However, if all you need to do is pull a premade meal out of the fridge and microwave it, you are much better off. Make sure to pick up some rugged, microwaveable containers to store your food. Now then, lets get started!

Use fat as a lever.  We’ve been taught to fear fat, but don’t! Both keto and low carb are high fat diets. Fat is our source of energy as well as satiety. The key to understand, though, is that fat is a lever on a low carb or keto diet. Carbs and protein stay constant, and fat is the one you increase or decrease (push the lever up or down) to gain or lose weight, respectively. So if your goal is weight loss, eat enough fat to be satisfied, but there’s no need to “get your fats in” once you’re satisfied.
In short, no. Apples even have too many carbs. Pineapples hugely spike insulin. Never consume fruit juices. The fiber is bound to the phytonutrients and the juice is cooked, removing many nutrients. You’re basically just drinking concentrated fructose + corn syrup. As an adult, I wouldn’t consume much fruit, period—except maybe ½ cup berries a day. Fructose consumption can lead to a fatty liver, insulin resistance and can spike insulin MORE THAN GLUCOSE!
"I recommend designing the meal around the fat and protein sources, since the carbohydrates are very limited. For example, if someone is having tuna for lunch, they may consider adding mayo to it. I also think a common mistake made on the diet, is individuals focus on reducing carbohydrates, but they do not increase their fat adequately. This may make it difficult to go into ketosis, especially if they are consuming too much protein. Some adults can be on a stable ketogenic diet consuming 50 net carbs whereas some may need to restrict to 15 net carbs."
You want to keep your cheats to none. Be prepared, make sure you’re eating what you need to be satiated (“full”), and make sure you’re satisfied with what you’re eating. If you have to force yourself to eat something, it will never work out in the end. This is just a guideline on how you can eat on a ketogenic diet, so you’re very welcome to change up what kind of foods you eat!
That is, until it's snack time—then, if you're on the keto diet, your'e basically SOL (unless, you know, you like having an entire steak for a snack). Think about it: All the best snacks are off limits on the keto diet (damn that fickle 70 percent fat, 25 percent protein, 5 percent carbs ratio). Granola bars, crackers, cookies—all off-limits on a keto diet.
Following the ketogenic diet can be safe in the short term but it does come with health concerns. 'It's not something that I recommend for the general population for the long-term,' says Dr Barclay. 'By drastically cutting out carbohydrate-containing foods, you'll miss out on the nutritional benefits of healthy choices like whole grains, fruit, starchy vegetables, and legumes such as beans, chickpeas and lentils.'
Indeed, there's plenty of research to support ketogenic diets in the treatment of some devastating neurological conditions. But can it really help the average Joe or Joanne lose weight? Well, yes, in theory — especially ultra low-calorie versions. But is it suitable for long-term, sustainable weight loss and improved health? The jury's still out on that.

A ketogenic diet plan is not a "special diet" that requires special foods. There is no need to buy any "low carb" packaged foods. Ketogenic foods are essentially just real, whole foods which are close to their natural state. In other words, they are not highly processed. The only exception to this is the category of artificial sweeteners. These are highly processed. However, I think these are important to include in a low carb diet plan, because a small amount of fake sweetener has less of a negative effect on health than the standard amounts of sugar in sweetened foods. Some people may prefer more natural sugar alcohol sweeteners, but studies have shown these are "antiketogenic" and can derail the process of ketosis for some. They effect each person differently, so you'll have to test to see if they effect your health or weight loss goals.
In a recent study in the Journal of Sports Medicine and Physical Fitness, Weiss and his colleagues found that participants performed worse on high-intensity cycling and running tasks after four days on a ketogenic diet, compared to those who’d spent four days on a high-carb diet. Weiss says that the body is in a more acidic state when it’s in ketosis, which may limit its ability to perform at peak levels.

First reported in 2003, the idea of using a form of the Atkins diet to treat epilepsy came about after parents and patients discovered that the induction phase of the Atkins diet controlled seizures. The ketogenic diet team at Johns Hopkins Hospital modified the Atkins diet by removing the aim of achieving weight loss, extending the induction phase indefinitely, and specifically encouraging fat consumption. Compared with the ketogenic diet, the modified Atkins diet (MAD) places no limit on calories or protein, and the lower overall ketogenic ratio (approximately 1:1) does not need to be consistently maintained by all meals of the day. The MAD does not begin with a fast or with a stay in hospital and requires less dietitian support than the ketogenic diet. Carbohydrates are initially limited to 10 g per day in children or 20 g per day in adults, and are increased to 20–30 g per day after a month or so, depending on the effect on seizure control or tolerance of the restrictions. Like the ketogenic diet, the MAD requires vitamin and mineral supplements and children are carefully and periodically monitored at outpatient clinics.[47]
Being in nutritional ketosis is a beneficial body state, and a great deal of research is being done on ketosis as it relates to disease. Ketone bodies themselves are beneficial, and have been shown to alleviate many disease conditions through  improvement of cellular energy pathways and mitochondrial health.  Ketogenic diets are now being used to treat medical conditions such as diabetes, epilepsy, autism, Alzheimer's, cancer and others and much of the success of these treatments is rooted in these cellular effects.
A ketogenic diet plan improves your health through a metabolic switch in the primary cellular fuel source to which your body and brain are adapted.  When your metabolism switches from relying on carbohydrate-based fuels (glucose from starch and sugar) to fat-based fuels and fat metabolism products called ketones, positive changes at a cellular level occur, and this translates into better overall health.  
Think about any social situations that will be encountered, and devise ways to handle those times when temptations to eat the "old" way will be high. You don't want to be blind sided when someone at the office brings in a box of your favorite chocolates and puts them right under your nose. Likewise, a beer with your friends usually turns into a date with potato skins and nachos. Think salad and steak instead.
All low-carbohydrate vegetables contain essential vitamins, minerals, fiber and antioxidants that are beneficial for our health. Cruciferous vegetables come with an extra health boost. They contain more vitamin K and A than many other vegetables, this is the reason why we put cruciferous vegetables on the list of top keto foods. The reason why crucifers vegetables like broccoli and cauliflower are at an edge over every other vegetable is because of sulforaphane. Sulforaphane is a compound that is created when we crush or chew cruciferous vegetables. Once it is digested, sulforaphane activates a cytoprotective (cell-protecting) pathway that protects the cells from oxidative stress and removes harmful toxins from the body. This is one of the primary reason why cruciferous vegetable consumption is linked to improved cognitive function and decreased cancer and heart disease risk. 
Another trigger of insulin is large quantities of protein. This was one of the issues with the Atkins diet. The optimum amount of protein per meal is about 3 to 6 ounces. Protein is needed for repairing and providing the raw material for muscle, tendons, joint cartilage, and even bone. Protein can also be used for fuel; however, too much protein triggers insulin which can be converted to sugar and then to fat. 

Achieving ketosis is a pretty straightforward, but it can seem complicated and confusing with all of the information out there.4If you want to learn more about ketosis and the scientific process around it, you can visit a very in-depth discussion about on Dr. Peter Attia’s website. Here’s the bottom line on what you need to do, ordered in levels of importance:
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