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Does the inability to metabolise a macronutrient really exist?
Thats not the correct term but as close as I could think.
My mother is/ was morbidly obese. Went low carb and then the weight almost melted off her. Her mum said that when she was a child she couldn't eat carbs they made her sick or something and the doc had given a low carb diet.
My G/F does really poor when on a low carb plan/ high fat plan and she can't jog at all. She plays sport heaps but has to do everything at a high intensity as she can't jog. Is it possible that she can't metabolise fat for energy and my mother can't metabolise carbs so just get stored as excess energy?
I've heard some talk about the carb question but never talked about fat like that.
Just a thought. Not sure if there is anything too it.
Yes, it is very possible and known to be unable to matabolize many different simple sugars. Take people who are lactose Intolerant for example. A same conditions exist for fructose (and most other sugars) but I do not remember its name or anything els about it for that matter .
As for fat that sounds more like the common HypoThyroidism.
I think your body also becomes good at processing and utilizing what you eat.
If one lives the high carb lifestyle for a long time, it might be quite a challenge to go low carb. It could take a long time before you could run or lift with any feeling of energy at the reduced carb levels.
On the flip side, I now eat pretty low carb, most of the time. 3 years now. (I still eat bread, pasta, rice, candy, cheesecake, apple pie, brownies, cookies, m&ms, beer, cheesecake, Hot Tamales, cheesecake, beans, tortillas, cheesecake, popcorn, etc.) but only occasionally. I feel like crap the day after I eat a lot of carbs. Not a lot compared to the old me, but say I have two sandwiches and a slice of cheesecake today. Tomorrow, I'll feel sluggish and bloated (not water retention, but in the gut). I don't feel sick or gassy, but I feel full, sluggish, and lethargic.
How much is phsychological and how much is physiological, I don't know. But (silent)'s lactose intollerant example is another good one. People eat a moderate amount of dairy every day and have no symptoms. Bump it up and get sick. Go without, then come back, get sick. Ramp up slowly, no problem.
sounds like your mom definitely had an issue, I don't know about your GF though. She's spent years working at a certain level in a certain way. If she spent 6-8 wks training low and slow she'd probably be able to do it.
Lost Dog put it in a good way, i agree the ability for your body to adapt to different things is amazing, i used to have a very high carb diet, than i went low and felt lethargic for about a week, then as i adapted it became easier and easier, but i do have a re-feed every 2 wks or so, mainly for psychological reasons and have higer carbs on days i work out mostly due to my post workout shake
So...lactose and fructose are only component parts of a category of macronutrients called carbohydrates.
Is it possible that your girlfriend doesn't metabolize fat? I suppose it's possible, if she had a severe genetic defect, but it would have to be a doozy of one for her to metabolize it enough absorb and store it but not to mobilize it. And if she was hypothyroid, she would have other symptoms other than "failure to lose weight".
Is it possible that your mother doesn't metabolize carbohydrates? Quite possible, given celiac disease can make people quite sick if they eat wheat, but in that case, they're not absorbing the wheat carbs either. Is it possible that your mother absorbs carbohydrates, processes them for storage, stores them but can't release them? Same argument as the one above.
I think you're smart enough to answer your own question
If she was unable to process fat then i doubt she would be living. Not to even mention the fact that such essential Vitamins (the fat soluble) would not be able to be processed by the body would they not?
Thats not the correct term but as close as I could think.
What Josh meant, not what he said...
pick your phrase of choice, but I think he meant something along these lines. "Can one's body/metabolism be predisposed to process certain macronutrients/foodstuffs in ways that are unfortunate to our heath and/or body composition?"
Yes.
I also say "sometimes."
Finally, I say "you can often change how you body reacts to these things through changing other aspects of diet and exercise, not to mention, giving your body time to change."
Does the inability to metabolise a macronutrient really exist?
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