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    Nutrition · Jun 05, 2019

    Our editorial team is made up of subject matter experts with extensive, real-world clinical experience who are highly trained in evaluating clinical research. Read more about our editorial policy here.

    The Complete Guide to Intermittent Fasting

    by Staff Writer
      |  LAST UPDATED: Jun 26, 2023
    The Complete Guide to Intermittent Fasting

    1. WHAT IS INTERMITTENT FASTING?

    Fasting has been practiced across the globe in various religions and cultures for thousands of years. Recently the ancient practice of fasting has taken on new twists making it a very popular health and fitness trend.

    It is known in the health and fitness world as intermittent fasting.

    Intermittent fasting (IF) is a cyclic eating pattern that alternates between periods of fasting and eating. It is important to note that IF does not specify what types of food you should eat, rather focuses on when you should eat them. Intermittent fasting resembles more of an eating pattern than a diet because there are no calorie restrictions.

    The various methods of intermittent fasting schedules include;

    • 16:8 Method
    • 5:2 Diet
    • Eat-Stop-Eat Method
    • Alternate - Day Fasting
    • Warrior Diet

    Amongst the various types of IF methods, the most popular style of fasting is the 16:8 method, which consists of a 16 hour fast.. Many intermittent fasters state that the 16:8 method is easy, convenient, and sustainable, increasing its appeal.

    2. 16:8 INTERMITTENT FASTING?

    16:8 intermittent fasting is a pattern of eating that allows you to have an 8 hour window of eating, and a 16 hour fast. A 16:8 IF can be repeated as often as you like, anywhere from daily to once or twice per week, depending on your personal preference.

    Out of all of the different intermittent fasting methods, this method is considered the least restrictive and most flexible.

    While there are many health benefits from 16:8 fasting, studies have shown that it can be particularly beneficial for athletes. Our article “Everything you need to know about intermittent fasting 16:8” discusses these benefits in detail. 16:8 IF has also been shown to have additional health benefits including weight loss, improved blood sugar, and increased brain function.

    3. HOW TO INTERMITTENT FAST...

    The first thing you should know about how long to intermittent fast and the 16:8 method, is that it is safe (assuming you do not have any underlying health conditions), simple, and sustainable. To get started, the first thing you need to do is pick an 8-hour window where you will consume your entire food intake for the day. Remember that your food intake should be limited only to your 8 hour window.

    Many people schedule their 8 hour window of eating between noon and 8 PM. By doing so, you only fast overnight and skip breakfast. The time frame in the noon to 8 PM fast allows you to enjoy two balanced meals and a few snacks throughout the day.

    Another popular time frame is an eating window of 9 AM to 5 PM. This option allows for a healthy breakfast around 9 AM, a normal lunch around noon, and a light early dinner or snack around 4 PM before your fast begins from 4 PM to 9 AM (next day).

    Both fasting options allow adequate time for you to consume nourishing and healthy meals.

    It doesn’t matter which option you choose, however consistency is important.

    In order to maintain blood sugar levels, and keep hunger under control, it is important that the meals and snacks you consume are spaced evenly throughout your 8 hour eating window.

    In order to ensure that you are receiving the adequate amount of nutrients, it is also equally vital that the type of food and beverages consumed during the 8 hour period are nutritious and whole.

    Every meal and snack should include a variety of whole foods such as:

    • Protein: Meat, poultry, eggs, fish, legumes, nuts, seeds, seafood.
    • Healthy fats: Olive oil, coconut oil, avocados.
    • Whole grains: Quinoa, brown rice, buckwheat, barley.
    • Vegetables: Cauliflower, kale, spinach, broccoli, cucumbers
    • Fruit: Bananas, apples, berries, oranges, pears.

    It is important to note that during the fasting period, drinking non-caloric beverages is allowed. In fact, maintaining good hydration may also help curb hunger during the fasting period. Calorie free beverages such as water, unsweetened tea and coffee are good sources of hydration. Though 16:8 intermittent fasting does not have any food restrictions, binging on junk food can negate any positive effects that 16:8 intermittent fasting may have.

    Therefore, make sure that you plan ahead to ensure that your 8 hour window of eating is filled with whole and nutritious foods, rather than fast food.

    4. HEALTH BENEFITS OF FASTING

    The simplicity, and convenience of 16:8 intermittent fasting makes it a very popular “diet.” Individuals following this eating pattern have found that the amount of time and money committed to food and preparation each week reduced once incorporating IF into their daily routines.

    Simplicity and convenience aren’t the only benefits of 16:8 intermittent fasting. There are numerous health benefits associated with this eating pattern as well, such as:

    • Increased Weight Loss: According to several studies published by the International Journal of Obesity, research has found that intermittent fasting for weight loss, even for a few hours per day, helps to decrease caloric intake as well as enhance the metabolism and increase weight loss.
    • Improved Blood Sugar: A 2014 study found that intermittent fasting lowers blood sugar levels and reduces fasting insulin, which may help decrease the risk of diabetes.
    • Enhanced Longevity: Preliminary research found that short-term, repeated fasting was an effective tool in prolonging the life span in mice.
    • Increased Brain Function: A review article found that intermittent fasting may prolong the health-span of the nervous system, which may lead to new approaches for preventing neurodegenerative diseases.

      5. INTERMITTENT FASTING MEAL PLAN

      Before you start any intermittent fasting plan, it is important to talk to a health professional before you get started to ensure that it is right for you. There are mixed opinions on whether or not certain intermittent fasting protocols can cause female hormonal imbalances. Therefore, women should be especially cautious before starting an intermittent fasting eating regimen. If fasting for 16 hours is too difficult, consider shortening your fast to 14 hours.

      To help get you started, here is a detailed 7-day meal plan for a 16:8 intermittent fast. This meal plan is designed for the following time frame: 12 PM – 8 PM eating window; 8 PM – 12 PM fast

      During fasting period (8 PM – 12 PM):

      • Drink non-caloric beverages (water, unsweetened tea & coffee)

      Day 1

      12:00 PM 

      3:00 PM

      6:00 PM

      7:30 PM

      3 oz Grilled Chicken

      ATH Build Paleo

      3 oz. Grilled Salmon

      Banana

      2 cups Salad

      Double Chocolate

      ½ cup Brown Rice

      Peanut Butter

      ½ cup Quinoa

      ¼ Avocado

      Chip Cookie Bites

      2 cups Grilled Vegetables

      Raisins for topping

      Dressing: Olive oil & Balsamic vinegar

       

      Salmon Seasoning: olive oil, lemon, pepper, paprika, salt

       

      Day 2

      12:00 PM

      3:00 PM

      6:00 PM

      7:30 PM

      Egg, Spinach, and Feta Omelet

      ½ cup Whole Grain Pretzels  

      Chicken and Vegetable Stir-Fry

      ATH Peanut Butter Build Shake

      ¼ Avocado

      ½ cup Hummus

      3 oz. Grilled Chicken

       

      1 slice Whole Wheat Toasted

      Celery Sticks

      Brown Rice Noodles

       

       

       

      2 cups Mixed Stir-Fry Vegetables

       

       

       

      Sauce: 2 tbsp. soy sauce, 2 tbs. oyster sauce, 2 tsp. sesame oil, garlic powder, salt, and cayenne to taste.

       

      Day 3

      12:00 PM

      3:00 PM

      6:00 PM

      7:30 PM

      Taco Salad

      ¼ cup Rolled Oats

      Kale and Sausage Rigatoni

      Dark Chocolate Almonds

      3.5 oz. Shredded Chicken

      Assorted Berries

      Pinch of Yum

       

      2-3 cups Lettuce

      Maple Syrup

       

       

      ¼ Avocado

       

       

       

      ¼ cup Pico de Gallo

       

       

       

      1 Whole-Wheat Tortilla

       

       

       

      Day 4

      12:00 PM

      3:00 PM

      6:00 PM

      7:30 PM

      Whole Wheat Wrap

      Red Bell Pepper

      Baked Potato w/Sour Cream

      Apple Slices

      Lettuce

      Guacamole

      Steamed Vegetables

      Peanut Butter

      Tomatoes

       

      3 oz. Grass Fed Grilled Steak

       

      3 oz. Grilled Chicken

       

       

       

      Hummus

       

       

       

      Day 5

      12:00 PM

      3:00 PM

      6:00 PM

      7:30 PM

      Avo and Egg Toast

      Cherry Tomatoes

      Sesame Noodle Bowls

      ATH Protein Waffles

      1-2 Slices Whole Wheat Bread

      Mozzarella

      From: Pinch of Yum

      Cottage Cheese

      1-2 Boiled Eggs

       

       

      Berries

      Avocado

       

       

      Honey

      Dash of cayenne, salt, and pepper

       

       

       

      Day 6

      12:00 PM

      3:00 PM

      6:00 PM

      7:30 PM

      1 Whole Wheat Wrap

      Sliced Fruit

      Red Lentil Soup

      2 cups Popcorn

      ½ cup Tuna

      Cheese

      From: NYT Cooking

       

      1  Boiled Egg

       

      Optional: ¼- ½ Avocado and Whole Wheat Roll

       

      Grated Cheddar Cheese

       

       

       

      1 Tomato (Sliced)

       

       

       

      1 handful Lettuce

       

       

       

      Day 7

      12:00 PM

      3:00 PM

      6:00 PM

      7:30 PM

      Greek Lentil Power Bowls

      1 Hard Boiled Egg

      3 oz. Grass-Fed Beef

      ATH Probiotic Frozen Yogurt

      From: Nutrition to Fit

      Sliced Carrots and Cucumbers

      Whole-Wheat Buns

       

       

       

      Lettuce and Tomato

       

       

       

      1 slice Cheddar Cheese

       

       

       

      Olive Oil Roasted Sweet Potato

       

      6. FOOD GROUPS AND SERVING SIZES

      It is important to remember that intermittent fasting is not a restrictive diet and does not follow a specific caloric value.

      The following chart is a suggestion of serving sizes and types of food that you should eat. If you find that you are fully satiated with less food or require more food for optimal function, listen to your body.

       Food Group Minimum Daily Servings  1 Serving Equivalents 
      Carbohydrates (whole-wheat or whole-grain) 6-8 Servings
      • 1 slice of whole wheat bread 
      • ½ cup muesli, rolled oats, quick oats
      • ½ cup cooked rice
      • ½ cooked pasta, noodles, quinoa, polenta
      Protein  2-3 Servings
      • 1 cup cooked legumes/beans
      • 3 oz fish, poultry, grass fed beef
      • 2 large eggs
      Healthy Fats 2-3 Servings 
      • 2 tsp olive oil
      • Small handful of nuts or peanut butter
      • 1/3 avocado
      Vegetables & Fruit 3-5 Servings 

      Non-starchy vegetables:

      • 1 cup raw vegetables or leafy greens
      • ½ cup cooked vegetables

      Starchy vegetables:

      • ½ medium potato or sweet potato
      • ½ cup corn
      • ½ cup peas
      • ½ cup carrots

      Fruit:

      • 1 medium whole fruit: apple, pear, orange, banana, apricot
      Dairy 2.5 Servings 
      • 1 cup milk
      • 1 cup yogurt
      • ½ cup ricotta cheese

       

      IMPORTANT THINGS TO REMEMBER

      There are many different ways you can choose to fast. Experiment and pick a time frame that works for you and your schedule. Before you start any type of intermittent fasting regimen, talk to your doctor or healthcare professional, especially if you have any underlying health conditions.

      16:8 intermittent fasting is an easy, and simple eating pattern that can help aid in weight loss and provide other health benefits. It is important to always listen to your body, and to fuel your body during your eating window with whole and nutritious foods. Hydration is also very important. Maintaining hydration with non-caloric beverages throughout the day is vital.

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