I wrote about my weight loss
last week. This week I'm going to cover some of the methods that have worked for me.
Scientific studies show that the ultimate contributor to body weight is the balance between "calories in" and "calories out". The other stuff is important, but it really does come down to thermodynamics.
Calories InThere are numerous places online to calculate your nutritional requirements.
MyPyramid is one of them, but check around for others. The goal is to find a reasonable target for daily food intake, so don't lie about how much physical activity you perform. In fact, I find that it works better to input the data as if you were completely sedentary (probably closer to the truth anyway). That way, the recommended caloric intake will be sufficiently low to actually accomplish something.
My recommended caloric intake (from multiple sites) is around 2500 kcal/day. The easiest way to start losing weight was to reduce that to ~2000 kcal/day. Right off the bat, there was a 500 kcal/day deficit. The formula goes something like this:
(-500 kcal/day) x (7 days/week) = -3500 kcal/week
There are approximately 3500 kcal per pound of body fat, so by cutting out 500 kcal/day, there is a theoretical loss of one pound per week.
Exercise (Calories Out)Exercise should focus on three goals:
1)build cardiorespiratory fitness
2)tone and develop muscles
3)increase the daily calorie deficit for weight loss
Cardiorespiratory (aka "cardio") fitness comes from aerobic exercise. This can mean swimming, jogging, treadmill, elliptical, etc. The target should be maintaining an elevated heart for around 30 minutes at a time. As your fitness improves, the level of resistance (or speed) will increase to achieve the same heart rate.
Toning and developing muscles is a natural byproduct of weight loss and increased physical activity. Muscle development shouldn't be the primary goal, since muscle tissue is more dense than adipose tissue. Gradually building muscle mass will allow you to lose weight at a more steady rate than attempting to lose fat via strength training.
The more muscle conditioning you have, the faster your body will burn calories. This comes from the simple equation:
more work = more energy required = more weight lost
The rate-limiting step is the work limit. Having better muscle tone and strength allows you to do more work, which burns more calories, which drops your body weight. Having "fit" muscles means that they will transition from resting to working more efficiently, which has the side effect of increasing your basal metabolic rate. This feeds back into the caloric requirement equation, and so on.
Nutritional QualityWhile "calories in - calories out" is the most important part of weight loss, nutritional quality is a close second. Here are the five main factors influencing the nutritional side of weight loss:
1. Energy density
2. Nutrient density and balance
3. Psychological appeal
4. Portions, portions, portions
5. food economy
Energy density is determined by the number of calories in a piece of food relative to its size. A tablespoon of olive oil has 120 calories, while a tablespoon of sugar has ~50. A tablespoon of chopped tomatoes has about 5 calories. This has obvious implications when making food choices during the day. You will feel less full (and therefore more hungry) if you eating energy dense meals. Not a good plan for sticking to your caloric intake goals.
Nutrient density and balance are basically the bang for the buck of everyday foods. Fruit and vegetables are high in nutrients, relatively low in energy, and have good bulk (more filling). This means that meals, especially breakfast and lunch, should have more fruit/veg content, and be lower in fat than the evening meal. Some people recommend eating a big lunch and a light dinner, but that strategy makes me sleepy at work and hungry at home (not a great result). Figure out what works for you.
The psychological appeal of different foods cannot be overlooked. I have found that if I focus on not eating junk food, it will just make it more appealing. Instead, try a replacement mechanism. I use frozen grapes in place of candy, homemade granola (low-sugar) instead of pop-tarts, and Diet Dr. Pepper in place of regular Dr. Pepper. Find whatever substitutions work for you, and stick with them. Pretty soon, you will wonder why you ever bothered with junk food in the first place.
Portion control is a pretty obvious factor in weight loss (or weight maintenance). Anybody with a half-measure of sense knows that eating enough to feel bloated is probably going too far. If you're brave, venture into an all-you-can-eat buffet restaurant. You will see that a high percentage of the patrons are...well...fat. There are obviously many factors at play, but the concept of eating as much as your belly can hold just makes zero sense from a weight-control standpoint. Plus, who wants to be the guy at the $6 buffet eating carrots and chicken? The natural urge is to gorge on fatty foods and "get your money's worth".
The buffet thing brings up another important point: food economy. What I mean is the marginal value of certain food preparations relative to weight-loss strategies. Example:
Meal A: pre-cooked, frozen meal; claims to be "healthy"; costs $3.50
Meal B: chicken breast, green beans, potato; prepared at home; costs $5.00
Some people will adamantly assert that Meal A (frozen) is more economical. They will stock up on frozen "healthy" meals and say that they are saving money and time. I admit, I have a few frozen meals in the freezer for time-crunched occasions. However, I would quickly become depressed if I ate that rubbery schlock more than twice per month. Instead, I take the extra 30-60 minutes of cooking time to make a meal that I enjoy. Also, with practice, you can learn to cook an extra portion for the next day's lunch. Anybody who chooses a Lunchable over reheated fried rice is an idiot or worse. Cooking your own food almost always yields better flavor, better nutrition, and better cost per serving than premade crap.
There are more factors at play for successful weight loss. I'll brew up a post in the near future and expand upon them.