Whatever the source of protein you consume, make sure they are organic grass fed and antibiotic-free, as they are generally healthier and safer for your body. In one study, researchers indicated that grass fed beef (regardless of cuts) contains more omega-3 acid and conjugated linoleic acid compared to grain-fed beef.21 As for non-meat sources of protein, try to look for organic and pesticide-free varieties.
Here's the Knowledge Stage analogy: Say we are hungry and want to go out to eat. It wouldn't make much sense to sprint to the nearest restaurant, right? Wouldn't we be better served to take the few minutes to learn about what's available, and then make a plan? Yes, we would take the time to Yelp or ask a friend for some knowledge and use that information to decide where we want to go.
Y. Wady Aude, MD; Arthur S. Agatston, MD; Francisco Lopez-Jimenez, MD, MSc; Eric H. Lieberman, MD; Marie Almon, MS, RD; Melinda Hansen, ARNP; Gerardo Rojas, MD; Gervasio A. Lamas, MD; Charles H. Hennekens, MD, DrPH, œThe National Cholesterol Education Program Diet vs a Diet Lower in Carbohydrates and Higher in Protein and Monounsaturated Fat, Arch Intern Med. 2004;164(19):2141-2146. http://archinte.jamanetwork.com/article.aspx?articleid=217514.
Ketogenesis has existed as long as humans have. If you eat a very low amount of carbohydrates, you starve your brain of glucose, its main fuel source. Your body still needs fuel to function, so it taps into your reserve of ketones, which are compounds the liver creates from fat when blood insulin is low. This process is known as ketosis: It's like when a hybrid car runs out of gas and reverts to pure electricity.
It's important to remember that the goal of any dietary change is to promote a healthy lifestyle, so make sure to select a meal plan you can envision yourself following long term. If you know you will not be able to comply with such stringent carbohydrate restrictions for years to come, the ketogenic diet is most likely not the right choice for you.
Aside from carb flu, be warned that staying in long-term, continuous ketosis may have drawbacks that may actually undermine your health and longevity. To stay on the safe side, I recommend undergoing a cyclic ketogenic diet. The "metabolic magic" that ketosis brings to the mitochondria actually occurs during the refeeding phase, not during the starvation phase.
If you'd like to try intermittent fasting, it's best to start by gradually decreasing your feeding window. Start with not eating for a 12 hour stretch, including the time that you're sleeping. For example, you could stop eating at 8 in the evening, then have breakfast at 8 in the morning. Ultimately, you'll want to be mostly done with digestion by the time you go to bed, and not be hungry until late morning, so for most people a feeding window of 10am to 6pm would be a good goal.
Sleep enough “ for most people at least seven hours per night on average “ and keep stress under control. Sleep deprivation and stress hormones raise blood sugar levels, slowing ketosis and weight loss a bit. Plus they make much it harder to stick to a keto diet, and resist temptations. So while handling sleep and stress will not get you into ketosis on it's own, it's still worth thinking about.
On the other hand, the types of foods you'll avoid eating on the keto, low-carb diet are likely the same ones you are, or previously were, accustomed to getting lots of your daily calories from before starting this way of eating. This includes items like fruit, processed foods or drinks high in sugar, those made with any grains or white/wheat flour, conventional dairy products, desserts, and many other high-carb foods (especially those that are sources of œempty calories).
Certain studies suggest that ketogenic diets may œstarve cancer cells. A highly processed, pro-inflammatory, low-nutrient diet can feed cancer cells causing them to proliferate. What's the connection between a high-sugar diet and cancer? The regular cells found in our bodies are able to use fat for energy, but it's believed that cancer cells cannot metabolically shift to use fat rather than glucose. (11)
Also make sure that you know what foods have mostly carbs, fat, and protein, so you can make the right choices. For instance, it's not just bread, pasta, chips, cookies, candy, and ice cream that contain carbs. Beans may contain protein, but they're also very high in carbohydrates. Fruit and veggies also mostly contain carbs. The only foods that don't contain carbs are meat (protein) and pure fats, like butter and oils (including olive oil and coconut oil).
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Medical Disclaimer: The material on this site is provided for informational purposes only and is not medical advice. Always consult your physician before beginning any diet or exercise program.
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