"DRS" <[email hidden]> wrote in message
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Quoted message said:Gags <drgagnon@nospam_ozemail.com.au> wrote in message [email hidden]
Quoted message said:onset) diabetes. A good rule of thumb with dieting for fat loss is to keep daily fat consumption
below 40 grams per day. The best way to achieve this is to buy one of the "Fats and Figures"
books for about five bucks from a bookstore and then keep a food diary for a few weeks. You
quickly get to know which foods to avoid due to their high fat content and you realise how you
need to adjust your eating habits to keep below 40g of fat a day (it is actually quite a
challenge).
There's no way you can advise anyone on their recommended daily fat consumption without knowing
enough about their physiology, lifestyle and goals to properly calculate their actual calorific
consumption, their BMR and then set their targets accordingly.
I am currently reducing my body fat% and I'm eating accordingly - yet my recommended daily fat
intake is (just checking the spreadsheet) 49.5grams. And I've lost about three kilos so far.
Hang on.......just getting up on my soapbox........
First up, good on you for making an effort to reduce your body fat %.
I find it hard to believe that you claim that I shouldn't reccomend keeping daily fat intake below
40g a day and yet on the strength of some spreadsheet, you can get your intake down to within 0.5 of
a gram?? I have spent considerable time researching and practicing fitness and fat loss through
various sources over the last 10 to 15 years but yet you are sure that the spreadsheet that you have
is the be all and end all??
I think that you may be making a mistake if you are judging your success by how much you weigh. The
recommended levels of SUSTAINABLE weight loss are generally quoted at approx 1 to 1.5kg per week. A
lot of diets that people "go on" give people a false sense of success when they lose weight (mainly
through fluid loss) in the initial stages. Unfortunately, when these people "go off" their diet, the
weight generally is put back on. Rather than losing weight, most people really wish to reduce body
fat levels and the most important factor for fat loss is the reduction of fat in the diet.
Quoted message said:The problem with the low fat message is that it's [censored] and any honest nutritionist
will tell you
the
Quoted message said:food pyramid we've grown up with is just accurate enough to be dangerous (there's a new one due
out soon).
Scaremongering.......it
Quoted message said:For the past twenty to thirty years we've been steadily reducing our fat intake and yet as a
society we've been getting steadily fatter. Think about it.
Almost true....the past few decades have seen levels of fat intake stabilise and perhaps decrease
slightly although there has also been an increase in the fat percentage in the diet. There are
suggestions that decreases in demands for physical activity through the advent of mod-cons have more
than offset the benefits gained from people exercising more and this has contribute to the rising
rates of over fatness.
Quoted message said:I don't advocate a full Atkins diet (too many saturated fats for starters) but he was right about
one thing: if you want to lose body fat you need to reduce your *carbohydrate* consumption.
Cutting your fats intake - and
you
Quoted message said:need the good fats, the poly- and monounsaturated ones, plus Omega-3
etc. -
Quoted message said:without cutting your *sugar* intake (which, at the end of the day, is all carbohydrates are) is a
recipe for... (wait for it)... GETTING FAT!
Broadly speaking the macronutritional breakdown for someone exercising regularly should be (in
this order of importance):
Protein: 0.8g/lb Lean Body Mass (that's your weight minus your fat). Fats: about 33% of your
target calories, of which saturated fats should be 33% or less. Carbohydrates: whatever is left.
It sounds like you are quoting directly from whatever eating plan you have currently decided is
right for you. As I said, I don't advocate any diets - just long term changes to eating habits. I
assume that by "good fats" you mean fats that don't contribute to rises in blood cholestorol?? You
are right in that you do need fat in your diet which is why I am advocating a low fat intake, not a
zero fat intake.
The "GETTING FAT" that you refer to is I think a reference to the results of a no fat, low energy
diet where the body goes into famine mode and starts storing fat.
I am interested to know how you calculate your Lean Body Mass??? There are many methods for
calculating bodyfat levels but unless you have access to a hydrostatic weighing facility (ie measure
weight in the water allowing for air trapped in lungs) or a DEXA machine (Dual energy X-ray
absorptiometer), then the results that you will get will not be accurate.
Skinfold Measurements can give a reasonable estimate but results will vary depending on the skill of
the operator and this method is also not accurate for obese subjects.
Bio Impedance Analysis (the scales that also put a small current through your body) are reasonable
but can provide varying results depending on your hydration levels at the time of testing.
The carbohydrates that should be increased in the diet are not the sugars, but instead the complex
carbohydrates such as starches found in wholegrain bread, potatoes, brown rice, cereals, etc. It is
pretty hard to get fat from eating just starches.
Quoted message said:The thing is this. Your body is incredibly good at keeping itself alive
and
Quoted message said:it will use whatever it has to.
True
Quoted message said:Having said that, it prefers certain energy sources to others, and since losing or gaining weight
is ultimately all about manipulating energy levels you can use that fact to your advantage.
Roughly speaking your body will use carbohydrates, then fats and lastly proteins as sources of
energy. So, when you cut back on the carbohydrates it will go for the fat stores next - which is
what you want. However,
don't
Quoted message said:cut your calorie intake too far below maintenance or your body will kick into starvation mode, and
it will do everything it can to avoid using its fat stores, so it will start targetting your
muscles. Breaking down proteins to use as energy is inefficient but in starvation mode it will do
that rather than use your fat stores.
It is not a simple as the body using one source of energy, then the next, then the next. Initial
exertion will use phosphates in the form of Adenosine Triphosphates (ATP) and Creatine Phosphate
that are stored in the muscles (normally about 10 seconds worth). This can be replenished in 1 or 2
minutes ready for the next 10 second burst. As activity is extended for a further minute or two, the
body starts utilising the Lactate Systems which is provides energy by anaerobic(no oxygen)
glycolysis (breakdown of glucose) to pyruvate. To utilise fat as an energy source, the body needs to
use the aerobic(with oxygen) energy system and enter the Krebs cycle. This results in the body using
a mixture of Glucose and Fat as energy sources. The percentages of each source used will vary with
the intensity and length of the session. Generally speaking, lower intensity exercise will result in
a higher percentage of fat being utilised.
For the body to start breaking down proteins, it needs to be in a pretty extreme situation and it
should not be applicable in general day to day life.
Quoted message said:So, having calculated your BMR and your actual daily calorific
consumption,
Quoted message said:if you want to lose weight healthily set a target daily calorific consumption about 500 calories
below maintenance, keep your protein and
fat
Quoted message said:intake at their correct levels, drop your *carbohydrate* consumption heavily - and you'll see your
body fat% drop slowly but steadily. There's roughly 3,500 calories per pound of fat so this regime
should consume
about
Quoted message said:one pound of fat per week, not including any loss of weight due to water loss.
Once again, how do you calculate your BMR (Basal Metabolic Rate)?? Unless you have access to a
metabolic chamber where all heat loss is measured for a 24hr period, your accuracy is restricted by
charts that do not take into account differences between individuals.
Daily energy consumption cannot be calculated without keeping some form of food diary.
If you keep your energy intake below your maintenance level of your BMR, you are not allowing for
exercise (the initial subject of this thread) and so your energy requirements could be far more than
what you are taking in. Very low energy level diets have the effect of reducing BMR which is counter
productive and not healthy.
Generally a low fat diet will be a high carbohydrate diet which is good given that the energy value
of fat (9 kcal/g) is double that of carbohydrates (4.5 kcal/g). Fats consumed are also much more
easily stored by the body as fat than carbohydrates consumed are. It takes about 25% of the energy
content of a gram of glucose (carbohydrate) to be stored as body fat compared to about 3% for the
body to store a gram of fat as body fat. The conversion of carbohydrate to body fat is known as "de
novo lipogenesis" and rarely happens except in the case of force-feeding of carbs (ie. carb loading
that elite athletes sometimes perform).
DRS, I am not just naysaying everything that you said and I think it is great that you are actively
looking at improving your body composition. I just seem to get the impression that you are currently
on a diet/program and are quoting a number of precise percentages and levels as if they are gospel.
I do not know the level of your experience in this field but I believe that many of your comments
are ill-informed. There are a million and one diets out there and most will result in some initial
weight loss due to reduction in energy intake......I hope that the one that you have chosen gives
you the results that you are after. Personally, with the risk of sounding vain, I believe that how
you look in the mirror and how your clothes feel are better indications of progress than purely your
weight. A combination of a sensible exercise program and low fat (but energy sufficient) eating
habits will result in a reduction in your levels of bodyfat. By slowly changing your body
composition and increaseing the percentage of FFM (Fat Free Mass) in your body you will improve the
way you look, increase your health, and increase your BMR.
Anyway.....time to get off my soapbox.
Gags