The best part of low carb eating is that you can still have rich, savory foods – dieting isn’t really a part of the lifestyle. Your body regulates your hunger naturally, so keeping your carbs low is the main concern. Being able to do that while still enjoying roast, fish, and big, healthy salads is what makes low carb so easy to stick with, and keep the weight off for good.
Insulin is needed to help cells absorb nutrients such as potassium, magnesium and amino acids (protein). In fact, almost every nutrient is influenced by insulin. Potassium is needed for energy, for balancing sodium in the body, and for all kinds of other important things. We need amino acids for our hair, nails, skin, joints and muscles. We need magnesium for a healthy heart. See where I am going? 
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.
Normal dietary fat contains mostly long-chain triglycerides (LCT). Medium-chain triglycerides are more ketogenic than LCTs because they generate more ketones per unit of energy when metabolised. Their use allows for a diet with a lower proportion of fat and a greater proportion of protein and carbohydrate,[3] leading to more food choices and larger portion sizes.[4] The original MCT diet developed by Peter Huttenlocher in the 1970s derived 60% of its calories from MCT oil.[15] Consuming that quantity of MCT oil caused abdominal cramps, diarrhoea and vomiting in some children. A figure of 45% is regarded as a balance between achieving good ketosis and minimising gastrointestinal complaints. The classical and modified MCT ketogenic diets are equally effective and differences in tolerability are not statistically significant.[9] The MCT diet is less popular in the United States; MCT oil is more expensive than other dietary fats and is not covered by insurance companies.[3]
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!
This two-day keto meal plan comes from a registered dietitian who prescribes the diet for clients who are looking to reach a variety of health goals. Pegah Jalali, MS, RD, CDN, is an adjunct professor at New York University, works at the NYU Langone Comprehensive Epilepsy Center, and is a private practice dietitian at Middleberg Nutrition, a New York City health and wellness practice.

We’ve included a printable shopping list and meal plan for your convenience! Again, use these tools as a reference and not as the be all end all. If you see something else on sale that you enjoy eating, go for that! This can be used as a framework for how to eat on keto. This isn’t the most ideal meal plan for optimal health, but it’s a pretty good one for cheap. I would recommend getting some coconut oil in this plan if possible, but we couldn’t fit it into our all-inclusive approach. If you buy in bulk on amazon coconut oil is cheap!
On the ketogenic diet, carbohydrates are restricted and so cannot provide for all the metabolic needs of the body. Instead, fatty acids are used as the major source of fuel. These are used through fatty-acid oxidation in the cell's mitochondria (the energy-producing parts of the cell). Humans can convert some amino acids into glucose by a process called gluconeogenesis, but cannot do this by using fatty acids.[56] Since amino acids are needed to make proteins, which are essential for growth and repair of body tissues, these cannot be used only to produce glucose. This could pose a problem for the brain, since it is normally fuelled solely by glucose, and most fatty acids do not cross the blood–brain barrier. However, the liver can use long-chain fatty acids to synthesise the three ketone bodies β-hydroxybutyrate, acetoacetate and acetone. These ketone bodies enter the brain and partially substitute for blood glucose as a source of energy.[55]
Advocates for the diet recommend that it be seriously considered after two medications have failed, as the chance of other drugs succeeding is only 10%.[9][30][31] The diet can be considered earlier for some epilepsy and genetic syndromes where it has shown particular usefulness. These include Dravet syndrome, infantile spasms, myoclonic-astatic epilepsy and tuberous sclerosis complex.[9][32]
Therein lies the problem, of course. You can’t just walk in to any store or restaurant and grab yourself some keto snacks. We are making progress on that front, for sure, but we’ve still got a ways to go. While there are a number of decent store-bought options like cheese, nuts, and hard-boiled eggs, there are potential pitfalls everywhere. Like beef jerky, which can often contain a startling amount of sugar and carbs.
There is scientific evidence that supports the use of a ketogenic diet to help manage certain neurologic conditions. There are also medical, nutrition, and fitness professionals that recommend the eating program for patients and clients who have other health goals. But just because the program works for some, doesn't mean that it's the best diet for you.
Here are a few of the most common side effects that I come across when people first start keto. Frequently the issues relate to dehydration or lack of micronutrients (vitamins) in the body. Make sure that you’re drinking enough water (close to a gallon a day) and eating foods with good sources of micronutrients. To read more on micronutrients, click here >