Showing posts with label they. Show all posts
Showing posts with label they. Show all posts

Sunday, April 17, 2016

Can MCTs Help You Lose Weight Yes They Can! Latest Meta Analysis Says MCTs Safe But Not Super Effective

Yes, coconut oil does contain MCTs, but it is not as some people believe pure MCT. Only ~50% of the fat in coconut oil is actually in MCT form. If you want pure MCTs you have to resort to specific MCT supplements / oils.
The mechanisms by which medium-chain triglycerides (MCTs) may help you to lose fat are manifold. They are not only hard to store for your body. They also counteract fat deposition in adipocytes by increasing thermogenesis and satiety.

MCTs contain 8 to 12 carbon atoms and include caprylic acid (C8:0, octanoic acid), capric acid (C10:0, decanoic acid), and lauric acid (C12:0, dodecanoic acid). Foods high in MCTs include coconut oil (58%), palm kernel oil (54%), desiccated coconut (37%), and raw coconut meat (19% of total energy) (USDA). Average intakes of 1.35 g/day (0.7% of total energy intake | USDA. 2008) MCTs have been reported in the United States and 0.2 g/day in Japan | Kasai. 2003).
Learn more about the effects of your diet on your health at the SuppVersity

Only Whey, Not Soy Works for Wheytloss

Taste Matters - Role of the Taste Receptors
Dairy Protein Satiety Shoot-Out: Casein vs. Whey

How Much Carbs Before Fat is Unhealthy?

5 Tips to Improve & Maintain Insulin Sensitivity

Carbohydrate Shortage in Paleo Land
MCT is cleaved into glycerol and medium-chain fatty acids in the gut lumen.5 The medium chain length makes a smaller, more soluble molecule compared with a longchain fatty acid, giving it a preferential absorption and metabolic route in the body. As the authors of the latest meta-analysis of the effects of MCTs on body weight say:
"[t]his physicochemical nature of medium-chain fatty acids allows them to pass into the portal vein on route to the liver to be rapidly metabolized via b oxidation with no requirement of reesterification in intestinal cells, incorporation into chylomicrons, or the rate limiting enzyme carnitine acyltransferase for intramitochondrial transport. In comparison, long-chain fatty acids have a slower route, being re-esterified in the small intestine and transported by chylomicrons via the lymphatic and vascular system before being oxidized for energy or stored. Thus, rapid metabolism of MCTs reduces their opportunity of adipose tissue uptake." (Mumme. 2015)
Several human intervention studies have been conducted investigating the weight-reducing potential of MCT, with mixed results. In their latest meta-analysis, Mumme et al. set out to separate the wheat from the chaff in order to answer the question whether MCTs, specifically C8:0 and C10:0, provide significant weight loss benefits and/or trigger changes in body composition compared to "regular" long-chain fatty acids (LCT).
Figure 1: Meta-analysis for changes in body weight (in kilograms) in randomized control trials that compared dietary medium-chain triglycerides (MCTs) with a longer-chain triglyceride (control) shows a favorable effect of MCT intervention on body weight. *Oleic acid as control. **Myristic acid as control. #Body mass index < 23. ##Body mass index > 23. IV inverse variance. SD standard deviation (Mumme. 2015).
The researchers primary outcome measures were body mass, waist and hip circumference, total body fat, and subcutaneous and visceral fat. Secondary outcomes were blood lipids, including triglycerides (TG), total cholesterol, high-density lipoprotein (HDL) cholesterol, and LDL cholesterol. Of the latter the foremost values are those that are of greatest interest and among them the body mass shows a measurable, albeit not earth-shattering reduction in almost all trials. Only the in the 2001 study by Matsuo et al. there was an increase in body weight in response to an MCT supplement that contained almost no medium chain triglycerides.
No, you wont lose slabs of body fat by adding MCTs to your diet! Unless, the satiety effect of MCTs makes you eat less on other meals, you are going to gain body fat by adding MCTs to your diet, because you are effectively increasing the total amount of energy in your diet - Dont be stupid.
Figure 2: Meta-analysis for changes in total body fat, total subcutaneous fat, and visceral fat (Mumme. 2015).
In view of the fact that the most relevant obesity parameters, i.e. the waist and hip circumferences and body fat percentages (Figure 2) dropped in all studies that investigated this parameter and considering the fact that there were no significant deterioration - rather improvements - in blood lipids, it appears warranted to assume that the replacement (!), but not the addition, of 2g/day MCTs (1% of the energy) to 54 g/day MCTs (20% of the total energy intake)  over a duration of 4 to 16 weeks leads to measurable and potentially health relevant weight loss, compared to bacon, butter & co, i.e. regular long chain fatty acids.
Bottom line: With an average weight loss of 0.51 kg (range 0.80 to 0.23 kg) over an average 10-week period, the weight loss may be marginal. In conjunction with similarly marginal, but measurable reductions in waist and hip circumferences, total body fat, subcutaneous fat, and visceral fat and in the absence of significant changes in blood lipids, even this amount of weight may be health relevant. Hamman,et al. were after all able to show that even marginal reductions in body weight (1kg) are associated with a 16% reduced type II diabetes risk in - albeit only in obese subjects (Hamman. 2006).

Trying to gain weight? Learn more in the Overfeeding Overview | go for it!
What MCTs are not, though, is the weight loss wonder as some people appear to believe they were. If you dont stop stuffing yourself with long-chain fatty acids and replace the latter with MCTs in your diet its unlikely that you are going to see any results.

Since the benefits also appear to decline with baseline body weight, buying tons of expensive and by no means delicious MCTs is probably a useless undertaking for 95% of the SuppVersity readers | Comment on Facebook.
References:
  • DeLany, James P., et al. "Differential oxidation of individual dietary fatty acids in humans." The American journal of clinical nutrition 72.4 (2000): 905-911.
  • Hamman, Richard F., et al. "Effect of weight loss with lifestyle intervention on risk of diabetes." Diabetes care 29.9 (2006): 2102-2107.
  • Kasai, Michio, et al. "Effect of dietary medium-and long-chain triacylglycerols (MLCT) on accumulation of body fat in healthy humans." Asia Pacific journal of clinical nutrition 12.2 (2003): 151-160.
  • Mumme et al. "Effects of Medium-Chain Triglycerides on Weight Loss and Body Composition: A Meta-Analysis of Randomized Controlled Trials." EAT RIGHT - Research Review (2015).
  • US Department of Agriculture. Nutrient Intakes From Food: Mean Amounts Counsumed per Individual, One Day, 2005-2006. Washington, DC: US Department of Agriculture, Agricultural Research Service; 2008.


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Friday, April 8, 2016

Training For Gains High Intensity Low Volume Strength Gains Stick Low Intensity High Volume Gains Dont But They Come With Significant Improvements in Body Comp

Its one thing to make strength and mass gains, its a whole different story to make them last - if possible, for the rest of your life! Study suggests: Training intense, may help.
Thank God for the Internet. Otherwise we would hardly be able to get our hands on papers that are written by Iranian scientists and published in the Turkish Journal of Sport and Exercise; and that, my dear (mostly) American friends, would be a real pity!

"Effect of acute detraining following two types of resistance training on strength performance and body composition in trained athletes" - thats the title of a paper that was published late last year but popped up in the major databases, only recently. In spite of the delay, the results Vahid Tadibi and his colleagues from the Razi University, the  University of Kordestan and the Islamic Azad University present in this 5-pages paper are unquestionably well worth being covered.
Dont forget to feed your muscles and learn more about protein intake at the SuppVersity

Are You Protein Wheysting?

Spread or waste your protein?

Protein requ. of athletes

High EAA intra-workout fat loss

Fast vs. slow protein

Too much ado about protein?
In view of the limited evidence available for the effect of detraining on strength training with different intensity and volume, Tadibi et al. set out to
"determine the influences of short term detraining after two kinds of resistance training on strength performance and body composition in trained athletes."  (Tadibi. 2013)
To this ends, the Iranian researchers recruited 30 healthy men students recruited from
Razi University of Kermanshah. The subjects were divided into two experimental groups as follows:
  • group (I) who performed resistance training with low intensity and high volume (GRI: n=15), weight 73.7±10.3 kg, height 174.5±7.5 m and age 24.7±1.4 years old and 
  • group (II) who performed low volume and high intensity (GRII: n=25), weight 63.2±6.2, height 175.8±5.5 and age 25.4±1 (years old). 
The participants attended physical education classes for six weeks/three times a week, with duration of 45-60 min each session. Each training session involved three phases in both groups and lasted 50–60minutes:
  • warm up, specific or related training and cool down. 
Warm up and cool down phases were similar in both groups included 7 min running with intensity sufficient to raise breath rate, 3 min stretching training.
Learn more about the effects of circuit training: When you build a circuit training routine, dont forget: There are lots of metabolically demanding kettle- bell exercises to spice things up. There are probably a dozen of reasons why people train. Many of them are really good: Wanting to stay healthy, to live longer, or to excel in your sports. Of others, however, I am not so sure whether they are actually worth pursuing, or do you think" - suggested read: "Circuit vs. Classic Strength Training, Which System is More Metabolically Demanding? What are the Energetic Costs and Where Does the Energy Come From, Fat or Glucose?" | read more.
The actual intervention, i.e. the specific training part consisted of fast-paced circuit training workouts with 60 to 90 seconds rest between the following exercises:
  • Figure 1: Graphical overview of the two training regimen
    bench press, 
  • squat, 
  • biceps curls, 
  • triceps extensions, 
  • shoulder press
What? No, I have no idea, if they forgot to list the back exercises, or if the subjects actually didnt do any. What I do know, though is that the
"[s]ubjects performed 12– 15 maximal repetitions/set (55–60% 1RM) in group I, low intensity and high volume (LIHV protocol), and 5 maximal repetitions/set (85–90% 1RM) in the group II, low volume and high intensity (HILV protocol)" (Tadibi. 2013)
In order to establish optimal progression the "1RM was retested in the end of every week so that resistance could be adjusted properly" (Tadibi. 2013).

TRAINING ? DETRAINING ? RESULTS?

Apropos progress, you will probably remember that the actual intention of the researchers was not to compare the muscle and strength gains during the six-week training program, but their persistence. Accordingly, the all-important question was what would happen, when the subjects resumed their normal active, but not necessarily resistance trained lifestyle after a 2-week lay-off of any type of systematic (training stoppage).
Figure 1: Relative changes in max strength (left) and body comp (right) from pre- to post-detraining (Tadibi. 2013)
Well, you can see the results of this type of realistic 6-weeks on 2-weeks of regimen in Figure 1 - a result based on which you should be able to confirm the following conclusions:
  • Contrary to what common wisdom would predict, the low intensity, high volume (LIHV) and the high intensity, low volume (HILV) regimen produce statistically identical strength gains over the course of the six-weeks training phased (not shown in Figure 1)
  • The gains on the high intensity, low volume (HILV) regimen were - albeit not significantly - but visibly more persistent than those that were brought about by the high volume low intensity regimen.
  • The high volume training turned out to have significant fat burning effects of the initially significant relative reduction in body fat % of 18% (from  12.15% to 9.73 in LIHV vs.   11.91% to 10.59% in the HILV group), there were yet only 7% left after 2 weeks of detraining (the BF% went back up from 9.73±3.12% to 11.27±3.37%).
As the researchers point out, this result may look different, if the study population was older or sick. In less-conditioned individuals (Hakkinen. 1994), which is - in my humble opinion - a very important hint for both, the young and old SuppVersity readers, as it confirms (once again), that the optimal training routine is a very individual thing and cannot be cookie cut based on a single study.
In the end the study at hand confirms the usefulness of periodization! At first it may seem as if the lasting effects of the high intensity, low volume training would suggest that this is the way to train. We must not forget, though that both "regular hypertrophy" as in protein synthesis and the architectual changes the muscle undergoes are two sided of the same coin. The goal should thus always be to have both come into their own.
Dont forget, you can learn more about periodization, here at the SuppVersity.
Lets go beyond the results and get to the underlying mechanisms and practical implications: In the absence of corresponding data, its obviously difficult to tell, whether the following hypothesis is accurate. Based on the research I have done for the Intermittent Thoughts on Building Muscle (read the article series), I would yet speculate that the persistence of the gains in the high intensity, low volume group reflects a difference in structural (muscle + nerves) vs. non-structural adaptations.

The latter has been observed previously with increased satellite cell recruitement, IFG-1 + MGF activity and corresponding changes in the structural architecture of the muscle (improved firing of motor units, incorporation of new satellite cells...) in response to high or even super-maximal intensity training & eccentrics and would speak in favor of "structural gains" vs. the mere "ballooning up" in response to the protein synthetic response of high volume strength training.

On the other hand, we all want the muscle to show, right? And if you look at the reduction in BF% after the 2 weeks of detraining its hard to argue in favor of high intensity training, when it comes to fat loss.
References:
  • Häkkinen, K. "Neuromuscular adaptation during strength training, aging, detraining, and immobilization." Critical Reviews in Physical and Rehabilitation Medicine 6 (1994): 161-161.
  • Tadibi, Vahid, et al. "Effect of acute detraining following two types of resistance training on strength performance and body composition in trained athletes." (2013).


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Wednesday, January 13, 2016

Lean vs Overweight Post Breakfast Skipping Binge is Overweight Specific Lean Subjects Reduce Both Energy 26 Sugar Intake 14 When They Skip Breakfast

It always hits the (already) big ones.
A recent study that was conducted by a group of researchers from the Roehampton University, and the Universities of Northampton and Hull in London took an interesting and totally overdue approach to dispel the myths that revolve around the anti-obesity effects of breakfast. In the said study, a team of researchers recruited 37 participants who were assigned to one out of four groups on the basis of their body mass index (BMI) - normal weight BMI <25 kg/m² | or overweight/obese BMI > 25 kg/m² | habitual breakfast eaters | habitual breakfast omitters.

Subsequently, even the latter, i.e. the breakfast eaters were requested  to  eat  breakfast  for  an  entire  week. The BREAKFAST week was followed by a one week wash-out and an entire  week during which the subjects had to omit breakfast.
Learn more about fasting and eating / skipping breakfast at the SuppVersity

Breakfast and Circadian Rhythm

Does Meal Timing Matter?

Breakfast & Glucose Metab.

Breaking the Fast, Cardio & the Brain

Does the Break- Fast-Myth Break?

Breakfast? (Un?) Biased Review
Over the course of the whole study period, all subjects hat do keep detailed 7-day food diaries, reporting what was consumed and the timing of consumption were completed for each breakfast condition.
Figure 1: Lean (left) and overweight (right) subjects react very different to breakfast skipping (Reeves. 2014)
As the data in Figure 1 already reveals, the total energy intake was significantly higher during the breakfast than the no breakfast week. But just as the scientists say, the present study did also reveal a "significant effects of timing on energy intakes": More energy was consumed during the afternoon in the no breakfast week compared to the breakfast week.

Timing and body weight, both make a difference!

In general, overweight participants consumed greater amounts of  energy than normal weight  participants (surprise ;-) in the early evening - the effect was even more pronounced for those of them who were regular breakfast omitters and thus used to feasting in the afternoon / evening.

Overall, this sounds as if having breakfast regularly was a very good idea, but unlike some people want to make you believe, the total energy intake does count. The same is yet also true for the amount of sugar, which skyrocketed in the overweight subjects in the no breakfast week. Running around on empty and being unable to tap into their affluent energy depots on the hips and around the waist, the insulin resistant (dont tell me about "healthy obesity!") overweight part of the study participants gravitated towards readily available energy intake.
Table 1: Mean sugar and micronutrient intakes in breakfast and no-breakfast conditions (Reeves. 2014)
Bottom line: Paired with the reduced folate and iron intake in the non-breakfast week, the previously outlined results of the study at hand highlight once more the practical value of having breakfast for the average American who is neither willing nor able to track his energy and macronutrient intake on a daily basis. In a controlled diet scenario,  on the other hand, lean individuals have no reason to eat breakfast, if they feel that intermittent fasting (=breakfast skeeping) helps them to stick to their planned energy intake.

If you take another look at the data in Table 1 to the right, you will after all realize that the lean study participants were able to live of their fat stores and did not have to resort to Snickers, Twinkies and *bs* "protein bars" with a sugar content of 85% - the sugar intake of the habitual breakfast eaters decreased significantly by 31% while their fibre intake remained stable in conjunction with the 26% reduction in energy intake this alone should have been enough to she a couple of pounds of body fat... So what? Good bye "healthy" breakfast cereals ;-)
References:
  • Reeves, Sue, et al. "Experimental manipulation of breakfast in normal and overweight/obese participants is associated with changes to nutrient and energy intake consumption patterns." Physiology & Behavior | Available online 24 May 2014.


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