I have a biochemistry exam tomorrow and this is some of the things I've been studying:
Dietary Carbohydrate Influence Nutrient Oxidation:
After you eat, most dietary carbohydrate is readily oxidized: either used immediately for
cellular functions or converted to glycogen for storage in the liver and the muscles. On
days when you eat a lot of carbohydrate, more carbohydrates are oxidized. A metabolic
process called diet-induced thermogenesis, may increase.
The elevation in your blood glucose and the increase in your glycogen stores put the brakes on appetite (in most people) so you do not eat more than you can use.
As a result, glycogen storage in the average person rarely reaches maximum capacity, which is about 1,500 carbohydrate calories.
Balance between carbohydrate intake and storage could also occur if excess carbohydrate
were stored as fat. It is theoretically possible for this to occur. However, having enough
excess carbohydrate to convert to fat would require an extremely high carbohydrate
intake for several days. Some experts have estimated that an intake of 2,000–2,500 kcal of carbohydrate over several days, after carbohydrate stores were at maximum, would be required before carbohydrate would be converted to fat.
Dietary Fat Influences:
If you decreased your carbohydrate intake? Would this force more fat to be burned?
Many popular high-fat, low-carbohydrate diets would lead you to believe so. Unfortunately,
replacing dietary carbohydrate with fat promotes obesity for several reasons:
1. Although the fat in your diet creates a feeling of stomach fullness, fats are overall less satiating than carbohydrates.
2.Carbohydrates control the rate of fat oxidation (“fats burn in a carbohydrate flame”),
and when carbohydrate stores run low, fat oxidation slows.
3.Fat intake does not stimulate an equal and proportional increase in fat oxidation.
When fat oxidation is less than fat intake, fat storage results
4. Unlike glycogen, fat stores are not limited in size.
- Nothing new but here is a good explanation I took from a book and wanted to share with you.
according to current scientific understanding you will use fatty acids as energy if your blood sugar level is normal. anytime your BG level is high you will have insulin in your blood. Insulin will resist lipolysis. T2 Diabetics dont clear sugar from their blood quickly so they have insulin around all the time and very little chance to burn fat - that is why they find it hard to lose weight on a "normal diet".
" you will use fatty acids as energy if your blood sugar level is normal"
I think you ment when you're blood sugar is low. Because when it is normal it means you have enough glucose so you don't need to use fat stores.
This use of fat stores can happen between meals, during physical activity or when you fast. But in the last case you also start to break down protein from the muscle wich is not good.
"Insulin will resist lipolysis" and also will tell your body to store fat.
why would it go low? Glycogen will convert to glucose right?
if im on the 80/10/10 my BG will never go low so how will i burn any fat?
If you eat a SAD diet you might have unstable blood sugar because of insulin resistance but if you are healthy your blood sugar shouldnt go low for long.
Only 5g of glucose in the blood at normal level. Not hard for glucagon to sort that out.
When you eat you have glucose available right? 2-3 hours latter the levels of glucose will lower because it has all been used by your cells. You also feel hungry at this point.
Only then glucagon will command glycogen to be converted to glucose and also regulates the rate of glucose production through lipolysis.
if you eat starch or sugars you will have glucose available. insulin will facilitate removal to cells. If your endocrine system is functioning properly (ie. you are not over insulin resistant and producing excess insulin then your BG level should return gradually down to normal. It should not go lower. Glucagon and insulin production IS NOT mutually exclusive. Its more like a balance control - as BG rises insulin does and glucagon goes down. But glucagon is never fully off. Neither is insulin fully off when you havent eaten. The glucose just cycles through different pathways.
You wont feel properly hungry unless your BG does go low. That is why people with insulin resistance over eat as a reaction to the low BG. People on low carb diets can report not eating for whole days and not feeling hungry because their blood sugar is rock solid level.
Great post! Thanks for sharing this :) Luckily I don't know anyone right now who is doing a high fat diet but my friend has a co-worker trying to eat 500cal/day to loose weight on some sort of special diet (apparently she takes lots of pills). It is so much more pleasant to be able to eat as much as you want (of the right foods) and know that they will burn the fat for you :)
Hey Amanda. If your undereating co-worker really wants to lose weight then you might pass Alison Andrews book From Fat to Fabulous: http://bit.ly/FATtoFAB
There is a ton of info including minessota starving experiment, she will understand that undereating will leed to binges and uncontrolable fat gain.
There is also few case studies of people we know from 30 BAD showing how they lost weight while enjoying massive amounts of calories.
I know that you can find it all here or in 801010 and other sources but the book is so damn good and the info is really dense! I loved it! http://bit.ly/FATtoFAB
500 cal/day???? that's insane!! + pills to mess up your metabolism. Sounds like it's really going to work!
i have done high fat-low carb. It seems to work for me - i lost 20lbs with no ill effects just some diahorrea when I first started doing it. Was eating as much as i wanted but ended up that i would eat max 1500 cals per day - quite hard to over eat on that- unless you start eating nuts. Have to do alot of cooking your own food to avoid carbs though.
What were your staple food on this diet?
And how much time it took you to lose that weight?
didnt really have a staple. lots of eggs, a higher than normal amount of fish and meat(usually fatty), lots of vegetables, lots of oils/fats, butter, cheese, cream and nuts . little bit of fruit
i think about 2 months to lose the weight with no exercise once i started doing it properly
Good luck with your exam, Felícia!