I’ve been reading about two caloriecalculationformula’s.
The most practically used is probably the Harris Benedict formula, which takes your sex, weight, age, height and activity level into account to calculate your caloriesneed. For men, it’s like this: 66+(13.7*weight in kg) + (5*height in cm) – (6.8* years) *
There is a flaw in this formula though, fat percentage and lean body mass. It simply assumes the average bodyfatpercentage.
A 120kg bodybuilder with 10kg fat would surely burns more calories than a 120 guy with 50kg fat.
A formula which does takes lean body mass as an equation is Katch-McArdle ( 370 + (21.6 X lean mass in kg) * )
Two problems though.
1) You have to know your exact body fat percentage to know your lean body mass. Besides underwater analysis, there are no good ways to measure your exact amount of body fat.
Bio Impedance (scales with bodyfat sensors) are inaccurate depending on your hydration level. Skinfold calipers can only measure subcutaneous fat. Fat between organs (the dangerous one) is not being counted.
2) It does not takes your weight into account. A person with 100kg lean body mass and 10kg fat will use less energy, compared to a person with 100kg and 50kg of fat. Hey, he doesn’t needs to lug that 40kg along with every step.
I’ve decided to use the average between the result of these two formulas to get my caloriesneeds.
According to Harris Benedict, I need 4052 calories a day to maintain weight. According to Katch-McArdle: 3215. (I’m using the lowest exercise multiplier 1.55 as I workout 6 times a week)
The average= 3650.
I eat about 2400-2800 calories daily (depending if I drink a protein shake after weight training), so that’s 1250-850 calories less than maintenace daily.
Since 1kg of fat equals to 7000 calories, I can indeed lose 1kg of fat every week. If HIIT or Tabata is indeed pumping up my caloryburn then it’d be even faster. The problem is, for each kg I lose, my calorieneeds will be lessened, so I have to keep an eye on that.
Actually, I believe that most people gets into a plateau is because they maintain their diet, even though they’re losing weight. They just forget that the less you weight, the less calories you need. Although if they manage to keep their lean body mass, they can in theory still continue to lose weight. It’s just that it’s almost impossible to lose weight without losing muscle mass. Even with sufficient weight training and high protein diet. If you weigh less, your body needs less strength to tally you around daily, so it will get rid of the expensive muscle mass.