Digestion hierarchy of macronutrients

[VNV]

How readily does fat convert to glucose?

Will the body convert protein to glucose via neoglycogensis before it converts dietary fat (not stored) into glucose? (And what's that process called--it's not lipogenesis and it's not lipolysis; is it gluconeogenesis?)

For example, let's my body is in a 500-calorie deficit. I give it 200 calories of carb., 200 calories of protein, and 200 calories of fat. The 200 calories of carb. will obviously become glucose, but where how much protein and how much fat will be converted out of that 400 calories to satisfy the remaining 300-calorie deficit?

 

[Turk]

I think it is gluconeogenesis (thats a bastard of a word to spell).

I do believe dietary fat converts to glucose before dietary protein. For purposes of calorie counting don't you just assume that all the calories will be utilised for sake of argument? I'm not sure what the bodies efficiency for digesting all the usable content of food is but i doubt its 100%.

 

[full_belly]

we probly overthinkin this all here.. but im sure dietary fat doesnt convert to glucose at all, the fatty acids are removed from they glycerol backbone and both intermediaries are oxidised at diff points in the energy production pathway..

protein covertin to glucose hiwevea is common = gluconeogenesis

 

[Turk]

we probly overthinkin this all here.. but im sure dietary fat doesnt convert to glucose at all, the fatty acids are removed from they glycerol backbone and both intermediaries are oxidised at diff points in the energy production pathway.

That sounds a little better! Its been such a long time since i did respiration and energy pathways.

 

[Fa Seeshus]

"Will the body convert protein to glucose via neoglycogensis before it converts dietary fat (not stored) into glucose?"


i think that is alot of the rationale behind Medium Chain Triglyceride use. the MCT is used as fuel before protein.... though i was never sure if you have to be in ketosis for this to happen?

i do know that when i am low carb and get light headed while training, drinking whey or liquid aminos helps more than taking the MCTs.

 

[j-bird]

thats not only the protein that you put in your mouth that can be converted to glucose during gluconeogenesis... body tissue

 

[MR. BMJ]

Gluconeogenesis = the creation of glucose from non-carbohydrate sources. Both Fat and Protein 'can' convert to glucose, with protein being much more efficient. Fat has a very low conversion, which is one reason why it is the preferred source of enerygy/fuel to eat on a ketogenic diet....= less conversion to glucose.

The more carbs in the diet, then generally, the less demand there is for gluconeogenesis to occur. The state the body is in...hypo/hyper-caloric, pre/post workouts, over-night fasting, etc, can have an effect on this as well.

I would say that with 200 calories of each macro, fat (~22 grams) will not be converted to glucose much at all, if any, since there is 200 calories (50 grams) of carbs present (and protein, which will be converted if needed, before the fat). The protein (50 grams; 200calories) is a toss-up, and I would not be able to give an accurate amount on how much will be converted to glucose.....with 50grams of carbs present at the same time, i'd say on the lower side. That's just a guess though.

BMJ

 

[kandaandm]

Well....how does protein convert to the horrible gas that all bb's get?

 

[halflife]

Well....how does protein convert to the horrible gas that all bb's get?

Nitrogen... which makes your urine smell strong.

 

[Dave_19]

we probly overthinkin this all here.. but im sure dietary fat doesnt convert to glucose at all, the fatty acids are removed from they glycerol backbone and both intermediaries are oxidised at diff points in the energy production pathway..

protein covertin to glucose hiwevea is common = gluconeogenesis

This is not true, fat can convert to glucose but its very inefficient, protein also can and its much easier for protein to convert to glucose than fat, but its still not some thing that will happen unless your body deems it necessary. for example if fat cals make up 65%+ of your diet on a daily basis, your body will be fueling primarily off ketone's and will have little need for glucose so the conversation ratio will be very little unless way over or under maintenance cals. if in a fasted state your body is way more to go into Gluconeogenesis but this still isn't some thing to concern your self with too much, I wouldn't skip fasted cardio for example just from fear of Gluconeogenesis if fat loss is your main goal.