Upload
daryl
View
69
Download
0
Tags:
Embed Size (px)
DESCRIPTION
WHEY vs. SOY. Marissa Gruber Rossana Ruvalcaba Kayla VanderKam Taran Lent & Marie Kirsch. What’s the Difference?. Whey Protein. Soy Protein. Whey is a component of cow's milk that is isolated in the standard cheese-making process. - PowerPoint PPT Presentation
Citation preview
Marissa Gruber Rossana Ruvalcaba Kayla VanderKam
Taran Lent & Marie Kirsch
WHEY VS.
SOY
What’s the Difference?• Whey is a component of
cow's milk that is isolated in the standard cheese-making process.
• Soy protein comes from soybeans-a plant source
Whey Protein Soy Protein
Which One Is Better?
• Studies are trying to determine which one is really more beneficial when it comes to weight loss .
• Both claim to be better than the other
• The 5 journals were studies on overweight people
“Whey Protein but Not Soy Protein Supplementation Alters Body Weight and Composition in Free-Living Overweight
and Obese Adults”David J. Baer, Kim S. Stote, David R. Paul, G. Keith Harris, William V. Rumpler, and Beverly
A. Clevidence
Double-Blind, Randomized Clinical Trial
The objective was to determine the effect of consumption of supplemental whey protein, soy protein, and an isoenergetic amount of CHO on body weight and composition in free-living overweight and obese but otherwise healthy participants
They used 90 overweight and obese participants.
Each person was randomly assigned to one of three groups:
• Group 1 was given Whey Protein
• Group 2 was given Soy Protein• Group 3 was given isogeneric
amounts of CHOThe study lasted 23 weeks.
Each supplement provided ~56 g/d of Protein.
Each participant consumed a beverage twice a day containing 1670 kJ/d.
Body weight and composition data were obtained monthly.
Dietary intake was determined using 24 hour recalls that were collected every 10 days.
The ResultsAfter 23 weeks:
body weight of the WP participants were lower by 1.8kg, than the group consuming CHO
Lean body mass did not differ but waist circumference was smaller in participants consuming the WP than the other two groups
After 6 Months: There was a significant difference in body
weight and fat mass between over weight and obese adults who consumed supplemental WP compared with those who consumed isoenergetic CHO.
The difference in body weight was associated with a decrease in fat without an effect on lean mass.
The experiment has low reliability and validity due to the fact that the subjects were only followed for 23 weeks with some continuing through a full 6 months
Without controlling the subjects diets and only supplementing protein into their diets twice a day, it would take much longer than 6 months to see real effects
“Weight loss without losing muscle mass in pre-obese
and obese subjects induced by a high-soy-protein diet”
P Deibert, D König, A Schmidt-Trucksaess1, K S Zaenker, I Frey, U Landmann and A Berg1
Randomized, controlled study
Started with 90 participants
BMI’s of between 27.5 and 35
Estimate the efficacy of a high soy protein and low fat diet in weight lose but no muscle mass loss
Three Groups: Lifestyle education group.
-3 teaching session twice a month -They were given nutritional counseling a
moderate fat, balanced diet
Substitution diet group -Given two soy-yoghurt-honey replacements
for their food for the first 6 weeks
Substitution diet with physical activity group-Same diet of the substitution diet group -60 minute physical activity twice a week
•Results:At the end only 83 people completed
the study 6 monthsThe BMI dropped for all three groups Lifestyle education group lost least
weight than the other two groupsHigh soy protein and low fat diet lost
more weight than just following a conventional diet
All 3 groups kept their muscle mass
Critical Review
German authors for a university
How much soy protein is needed to actually achieve weight loss
Not enough people
Male/ female?
“Comparison of the effects of cows’ milk, fortified soy milk, and calcium supplement on weight and fat
loss in premenopausal overweight and obese women”
Sh Faghih, A.R. Abadi, M. Hedayati, S.M. Kimiagar
100 women
20-50 years old
Overweight or obese
25-40 BMI
The Groups: All were asked to consume 500 fewer kcals/day
Control groupSupplement group:
• 800mg/day calcium carbonate
Milk group: • 3 servings of low-fat milk
per daySoy group:
• 3 servings of calcium fortified soy per day
After 8 weeks …
85 women finished
Weight, BMI, waist circumference, and hip circumference were re-measured
“The greatest changes were seen in the high dairy group in all variables.” [3]
Critical Review
This study was non-bias and there was no conflict of interest.
Problem: 8 weeks was too short!
Longer studies have shown some conflicting results.
“A whey-protein supplement increases fat loss and spares lean muscle in obese subjects: a randomized human clinical
study”By: Joy L Frestedt, John L Zenk, Michael A Kuskowski, Loren S Ward and Eric D Bastian
Objective: test the effects of a whey supplement on weight loss
Randomized, double blind, 12-week study
158 obese subjects
Independent variable: the consumption of the whey supplement
Dependent variable: weight loss, body fat loss, and lean muscle mass retention
Whey supplement group lost more body fat and retained more lean muscle mass
The Study
CRITICAL REVIEW Funded by Gianbia Nutritionals
Inc.
Use of completers vs. responders data
“Acute effects of whey protein isolate on cardiovascular risk factors in overweight, post-menopausal women”
Sebely Pal, Vanessa Ellis, Suleen Ho
OVERWEIGHT AND OBESE POST-MENOPAUSAL WOMEN ARE HIGHLY SUSCEPTIBLE TO CARDIOVASCULAR DISEASEINVESTIGATE THE ACUTE EFFECTS OF DIETARY WHEY PROTEINS ON LIPIDS
GLUCOSE AND INSULIN THREE-WAY CROSSOVER DESIGN 21 OVERWEIGHT OR OBESE, POST-MENOPAUSAL
WOMEN RANDOMIZED CONSUME EITHER 45 GRAMS SODIUM CASEINATE
OR 45 GRAMS OF A GLUCOSE CONTROL WITH A BREAKFAST MEAL
The Results No significant change between groups in postprandial
incremental area under the curve for: total cholesterol low density
lipoprotein, high density lipoprotein, non-esterified
fatty acids, Apo B48, insulin
leptin
There was a significant decrease in the appearance of triglycerides in the blood by 21% and 27% after consuming the whey meal compared to control and casein meals
It can be suggested that a single dose of whey protein can decrease arterial exposure to smaller triglyceride-enriched lipoprotein particles compared to the glucose and casein
Whey protein has beneficial effects
Effective supplement that can help lower the triglycerides in the body which consequently lowers the chances of postprandial lipidemia
CRITICAL REVIEW
Conclusion1 invalid study concerning the whey protein supplement
The short duration of time spent on the research
Longer trials were necessary
More control over what the subjects were or were not eating
Whey protein was seen in an overall positive light
Soy- not as good as whey