This is the equation: calories in, calories out: When we take in more calories than we burn, we gain weight. It’s that simple. We take in calories through eating, and we burn calories through our base metabolism and our activities, which include exercise.
If we examine how many calories we consume and how many we expend, it’s easy to see why we gain weight. The average person burns about 1,800 calories through base metabolism—the energy required to breathe, digest food, and so on. The energy we need for our activities is added to this—about 700 for an average North American.
This adds up to about 2,500 total calories per day. If we take in more calories than our average, we gain weight. If we don’t expend more calories than our average, we don’t lose weight.

Now let’s look at food. A typical North American fast-food meal contains about 1,500 calories. So, in one meal, we have already consumed more than half the calories we need for a day!
A typical North American meal prepared at home—meat and a few vegetables, and maybe a salad—contains about 1,000 calories. So, in two meals, we have consumed what we burn in a day. Anything more that we eat—a third meal, snacks, sodas, other drinks—translates into weight gain. No wonder so many of us is overweight!
3 Day Diet
The 3 Day Diet is one of the most popular short-term fad diet around today. Many people adopt the diet to try and achieve short-term weight loss. However, unfortunately most people simply gain the weight back on again.
The 3 Day Diet is simply a low calorie diet (as can be seen by the meal plan). There is nothing magical - no mystical chemical reaction that goes on (as some seem to think). Weight loss is due to a sudden drop in calories - some of this may be fat - but most will be from water loss.
Breakfast---Black coffee or tea (Sweet & Low or Equal) or water1/2 Grapefruit or Juice1 slice toast with 1 Tbsp. Peanut Butter
Lunch---1/2 Cup of Tuna 1 slice toastBlack coffee or tea (Sweet & Low or Equal) or water
Dinner---3 oz. any lean meat1 cup green beans1 cup carrots1 cup vanilla ice cream1 medium appleBlack coffee or tea (Sweet & Low or Equal) or water
DAY 2
Breakfast---Black coffee or tea (Sweet & Low or Equal) or water1 egg (any style)1 slice toast1 banana
Lunch---1 cup cottage cheese or tuna5 saltine crackersBlack coffee or tea (Sweet & Low or Equal) or water
Dinner---2 beef franks or hot dogs1/2 cup carrots1 banana1 cup broccoli or cabbage1/2 cup vanilla ice creamBlack coffee or tea (Sweet & Low or Equal) or water
DAY 3
Breakfast---Black coffee or tea (Sweet & Low or Equal) or water5 regular saltine crackers1 oz.(slice) cheddar cheese 1 apple
Lunch---1 hard boiled egg1 slice toastBlack coffee or tea (Sweet & Low or Equal) or water
Dinner---1 cup tuna1 cup carrots1 cup cauliflower1 cup melon1/2 cup regular vanilla ice creamBlack coffee or tea (Sweet & Low or Equal) or water
Condiments Allowed
*Lemon (and lots of it, if you like)
*a dash of salt and/or pepper
*mustard
*cooking spray
Substitutions
Some people use the following substitutions for the 3 day diet:
*Orange instead of Grapefruit
*Tuna instead of Cottage cheese (and vice versa)
*Frozen yogurt instead of Ice Cream
*Cauliflower instead of Broccoli (and vice versa)
*Green beans instead of Broccoli or Cauliflower
*Beets instead of Carrots
*Toast instead of 5 crackers (vice versa)
