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  • EATING FOR SIZE (Thouhts)

    Found this on the MD site and was just curious what every one thought.

    http://www.musculardevelopment.com/a...-your-age.html

    By Layne Norton

    “Young men think old men are fools; but old men know young men are fools.”

    —George Chapman (1559-1634)

    Much has been written about nutrition in the pages of MD over the decades. I’m sure many readers who began reading when they were teenagers are now entering their 30s and 40s. Countless pages have been devoted to describing nutritional protocols to maximize gaining muscle and losing fat. But I submit to you that we have all been fools— not just the young as George Chapman implies. There are fundamental metabolic differences between age groups— yet most nutritional recommendations for maximizing muscle don’t take age into account! In this young fool’s opinion, it’s time we all examined optimal anabolic eating for YOUR age, addressing each of the macronutrients.

    Protein

    We might as well get the big issue of protein intake out of the way first. If you read MD, you know high-protein meals increase muscle protein synthesis and this builds more muscle. The question is, how does age affect this anabolic response to protein? Research suggests that younger individuals are very sensitive to the anabolic effects of amino acids.1-3 However, as we age, we become less sensitive to the anabolic effects of amino acids. Several researchers have shown that comparatively large doses of amino acids are required to maximize the anabolic response in the elderly, as opposed to the young subjects.1,2,5-9

    It appears the decreased response in the elderly may be explained by a decrease in the muscle cell content and activity of mTOR and p70S6K, two kinases involved in directing protein synthesis.2,5 According to this research, older subjects require a greater amount of amino acids, specifically leucine (the amino acid responsible for stimulating protein synthesis), to maximize protein synthesis, as opposed to younger subjects.7-9 Furthermore, it appears that the decreased anabolic response in the elderly may be due, at least in part, to increased production of reactive oxygen species (ROS) with age.

    ROS has been shown to decrease mTOR activity and inhibit protein synthesis.10 But there is hope— it has been demonstrated that supplementation with a combination of antioxidants (rutin, vitamin E, vitamin A, zinc and selenium) restores the anabolic effect of a meal to the same level as the young!11 So make sure you eat plenty of protein that is high in leucine (e.g., whey) and keep room in that pillbox of yours for some antioxidants, Grandpa!

    Protein Recommendations:

    <20 years old: 0.7-1 grams/pound bodyweight

    21-40 years old: 0.9-1.2 grams/pound bodyweight

    41-65 years old: 1.1-1.4 grams/pound bodyweight

    >65 years old: 1.3-1.5 grams/pound bodyweight



    Carbohydrates

    Carbohydrates are another macronutrient that differentially impact anabolism as people age. The primary way in which carbohydrates influence anabolism is by increasing insulin secretion. Young individuals are very sensitive to the anabolic effects of insulin and in their case, carbohydrates alone may be sufficient to increase protein synthesis and also inhibit protein degradation.12 Recall that Net Muscle Gain = Muscle Protein Synthesis - Muscle Protein Degradation, so insulin is both anabolic and anti-catabolic in young individuals.

    In adult subjects, carbohydrates fail to increase protein synthesis when they are consumed alone.13 Carbohydrates do have a synergistic effect on protein synthesis with amino acids in adults and can induce a greater anabolic response when combined with protein, as opposed to consuming protein alone.14 It also appears that insulin will still inhibit protein degradation in adults and therefore is anti-catabolic, with the potential to optimize the anabolic effects of amino acids.15

    Though little data is available for the elderly, it is clear that physiological increases in insulin that would be induced by consuming carbohydrates alone will not stimulate muscle protein synthesis.14 It does appear that, in the elderly, co-ingestion of carbohydrates with amino acids does provide a small anabolic advantage over amino acids alone.14 Since carbohydrates do not provide the same anabolic advantage to the elderly as they do other age groups and because aging reduces insulin sensitivity, it is likely that elderly muscleheads will want to consume less carbohydrates than young or adult individuals.16

    Carbohydrate Recommendations:

    <20 years old: 2.2-3.2 grams/pound bodyweight

    21-40 years old: 1.7-2.7 grams/pound bodyweight

    41-65 years old: 1.2-2.2 grams/pound bodyweight

    >65 years old: 0.7-1.7 grams/pound bodyweight

    Keep in mind, these recommendations are for maximizing muscle gain and will need to be adjusted accordingly for individuals wanting to lose body fat.

    Fat

    The difference in how dietary fat should be consumed as one ages should largely be influenced by the changes in carbohydrate intake with age. As outlined previously, one should gradually reduce carbohydrate intake throughout their life as they age. Therefore, someone who is younger and still sensitive to the anabolic effects of carbohydrates will be better off consuming lower fat with more carbohydrates, while an elderly individual will want to consume far less carbohydrates and fill in those calories instead with more protein and fat.

    Fat is a very important macronutrient and it’s important that one never let it fall too low. I recommend that fat intake never be less than 0.2 grams per pound of bodyweight. Even if the individual is young and highly sensitive to the anabolic effects of insulin, it’s still important to consume sufficient fat.

    Fat Recommendations:

    <20 years old: 0.25-0.4 grams/pound bodyweight

    21-40 years old: 0.35-0.5 grams/pound bodyweight

    41-65 years old: 0.45-0.6 grams/pound bodyweight

    >65 years old: 0.55-0.7 grams/pound bodyweight

    Keep in mind that these are just general recommendations. Optimal macronutrient intake is based on numerous factors and it is always best to experiment to find out what will fit best with your individual metabolism. This article will help everyone better understand how age can impact optimal macronutrient profiles and the adjustments that can be made to best optimize these macronutrient profiles.

    References:

    1. Paddon-Jones D, Sheffield-Moore M, Zhang XJ, Volpi E, Wolf SE, Aarsland A, Ferrando AA, Wolfe RR. Amino acid ingestion improves muscle protein synthesis in the young and elderly. Am J Physiol Endocrinol Metab, 2004 Mar;286(3):E321-8.

    2. Cuthbertson D, Smith K, Babraj J, Leese G, Waddell T, Atherton P, Wackerhage H, Taylor PM, Rennie MJ. Anabolic signaling deficits underlie amino acid resistance of wasting, aging muscle. FASEB J, 2005 Mar;19(3):422-4.

    3. Drummond MJ, Miyazaki M, Dreyer HC, Pennings B, Dhanani S, Volpi E, Esser KA, Rasmussen BB. Expression of growth-related genes in young and old human skeletal muscle following an acute stimulation of protein synthesis. J Appl Physiol, 2008 Sep 11. [Epub ahead of print]

    4. Welle S, Thornton CA. High-protein meals do not enhance myofibrillar synthesis after resistance exercise in 62- to 75-yr-old men and women. Am J Physiol, 1998; 274 (4 Pt 1):E677-E683.

    5. Guillet C, Prod’homme M, Balage M, et al. Impaired anabolic response of muscle protein synthesis is associated with S6K1 dysregulation in elderly humans. FASEB J, 2004; 18:1586-1587.

    6. Katsanos CS, Kobayashi H, Sheffield-Moore M, et al. Aging is associated with diminished accretion of muscle proteins after the ingestion of a small bolus of essential amino acids. Am J Clin Nutr, 2005; 82:1065-1073.

    7. Katsanos CS, Kobayashi H, Sheffield-Moore M, et al. A high proportion of leucine is required for optimal stimulation of the rate of muscle protein synthesis by essential amino acids in the elderly. Am J Physiol Endocrinol Metab, 2006; 291:E381-E387.

    8. Dardevet D, Sornet C, Bayle G, et al. Postprandial stimulation of muscle protein synthesis in old rats can be restored by a leucine-supplemented meal. J Nutr, 2002; 132:95-100.

    9. Rieu I, Balage M, Sornet C, et al. Increased availability of leucine with leucine-rich whey proteins improves postprandial muscle protein synthesis in aging rats. Nutrition, 2007; 23:323-331.

    10. Patel J, McLeod LE, Vries RG, Flynn A, Wang X, Proud CG. Cellular stresses profoundly inhibit protein synthesis and modulate the states of phosphorylation of multiple translation factors. Eur J Biochem, 2002 Jun;269(12):3076-85.

    11. Marzani B, Balage M, VĂ©nien A, Astruc T, Papet I, Dardevet D, Mosoni L. Antioxidant supplementation restores defective leucine stimulation of protein synthesis in skeletal muscle from old rats. J Nutr, 2008 Nov;138(11):2205-11.

    12. Fujita S, Rasmussen BB, Cadenas JG, Grady JJ, Volpi E. Effect of insulin on human skeletal muscle protein synthesis is modulated by insulin-induced changes in muscle blood flow and amino acid availability. Am J Physiol Endocrinol Metab, 2006 Oct;291(4):E745-54.

    13. Gautsch TA, Anthony JC, Kimball SR, Paul GL, Layman DK, Jefferson LS. Availability of eIF4E regulates skeletal muscle protein synthesis during recovery from exercise. Am J Physiol, 1998 Feb;274(2 Pt 1):C406-14.

    14. Volpi E, Mittendorfer B, Rasmussen BB, Wolfe RR. The response of muscle protein anabolism to combined hyperaminoacidemia and glucose-induced hyperinsulinemia is impaired in the elderly. J Clin Endocrinol Metab, 2000 Dec;85(12):4481-90.

    15. Rasmussen BB, Fujita S, Wolfe RR, Mittendorfer B, Roy M, Rowe VL, Volpi E. Insulin resistance of muscle protein metabolism in aging. FASEB J, 2006; 20:768-769.

    16. Kruszynska YT, Petranyi G, Alberti KG. Decreased insulin sensitivity and muscle enzyme activity in elderly subjects. Eur J Clin Invest, 1988 Oct;18(5):493-8.
    Last edited by homonunculus; 08-16-2012, 11:43 PM.
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  • #2
    http://www.intensemuscle.com/showthread.php?t=45633
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    • #3

      LOL - Good to see the topic was addressed completely in that thread...

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      • #4
        Not that I am that old, but at almost 29 I notice a huge difference in how my body seems to process carbs vs when I was about 10 years younger.

        I just grow a big belly now if I don't watch the carbs.

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        • #5
          Originally posted by homonunculus View Post
          LOL - Good to see the topic was addressed completely in that thread...

          -S
          It was obviously beaten to death Scott
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          • #6
            Originally posted by SkinnyMike42 View Post
            Not that I am that old, but at almost 29 I notice a huge difference in how my body seems to process carbs vs when I was about 10 years younger.

            I just grow a big belly now if I don't watch the carbs.
            You and me both!!

            Didn't know that this had been already covered. Looks like MD might be running out of thing to write about?
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            • #7
              Originally posted by SkinnyMike42 View Post
              Not that I am that old, but at almost 29 I notice a huge difference in how my body seems to process carbs vs when I was about 10 years younger.

              I just grow a big belly now if I don't watch the carbs.
              Do you think this has something to do with your hormone levels (I read your other thread) or do you think you are less active. It's amazing when I started wearing a pedometer how you may be doing a lot more "work" on a busy day. On a busy day I would easily hit 20,000 steps without thinking about it, but if I didn't have much to do I'd only get in 10,000 steps in. This may or may not seem like much, but if you think about it 10 years earlier on average you were probably more mobile and on average burnt more calories. I believe there is a metabolic slow down as you age, but I also think a lot of this "I don't burn as much calories as I was young." has a lot to do with your daily activity level. I mean I know when I was 18-21 I was working, training, and going to school full time, Oh and I was chasing girls (not literally) to all hours of the night. So compare that with being a dad and working a full time job where you are sitting a lot of the time. May not be much of a difference every day, but on average this may amount to a lot more calories burnt. No, I don't have any science to throw into this, but is seems a reasonable conclusion to me.
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              • #8
                Honestly, probably less active. I sit at a desk all day and I do zero cardio (vs playing D1 baseball in college where they ran us daily like it was boot camp), so yeah not exactly a scientific finding on my part.

                However, I still have noticed if I eat the same calories, but keeps carbs low and fats high (most notably on off days) that I get leaner quicker or I APPEAR leaner.

                I used that approach this last cut and used a lot of steak for dinner in place of my chicken/rice. My stomach was looking much better on a day to day basis, but then again that could just be lack of bloat from lack of carbs? I don't know..all I know is that my stomach protrudes badly if I eat too many carbs.

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                • #9
                  Originally posted by Doberman View Post
                  Do you think this has something to do with your hormone levels (I read your other thread) or do you think you are less active. It's amazing when I started wearing a pedometer how you may be doing a lot more "work" on a busy day. On a busy day I would easily hit 20,000 steps without thinking about it, but if I didn't have much to do I'd only get in 10,000 steps in. This may or may not seem like much, but if you think about it 10 years earlier on average you were probably more mobile and on average burnt more calories. I believe there is a metabolic slow down as you age, but I also think a lot of this "I don't burn as much calories as I was young." has a lot to do with your daily activity level. I mean I know when I was 18-21 I was working, training, and going to school full time, Oh and I was chasing girls (not literally) to all hours of the night. So compare that with being a dad and working a full time job where you are sitting a lot of the time. May not be much of a difference every day, but on average this may amount to a lot more calories burnt. No, I don't have any science to throw into this, but is seems a reasonable conclusion to me.

                  I would agree, being a younger guy... It even comes down to things you might have gone out and done that you don't anymore..

                  At 21 you might have gone and played pick-up basketball, now at 40 you go to the movies and sit there.
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                  • #10
                    Originally posted by SkinnyMike42 View Post
                    Honestly, probably less active. I sit at a desk all day and I do zero cardio (vs playing D1 baseball in college where they ran us daily like it was boot camp), so yeah not exactly a scientific finding on my part.

                    However, I still have noticed if I eat the same calories, but keeps carbs low and fats high (most notably on off days) that I get leaner quicker or I APPEAR leaner.

                    I used that approach this last cut and used a lot of steak for dinner in place of my chicken/rice. My stomach was looking much better on a day to day basis, but then again that could just be lack of bloat from lack of carbs? I don't know..all I know is that my stomach protrudes badly if I eat too many carbs.
                    Most likely a difference in water retention.
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                    • #11
                      Originally posted by fade View Post
                      Most likely a difference in water retention.
                      BINGO.....I have smoothed out quite nicely over the last five days....lol
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