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Related Concept Videos

Proteins: Dietary Sources and Requirements01:28

Proteins: Dietary Sources and Requirements

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Consuming animal-based products offers high-quality proteins that contain optimal levels and combinations of essential amino acids, crucial for tissue repair and growth. Foods like eggs, milk, fish, and most meats are a source of complete proteins. Legumes and cereals are abundant in proteins; however, they typically lack a full range of essential amino acids. As a result, they are considered incomplete protein sources. Some plant sources like soybeans, quinoa, and amaranth do contain complete...
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Overview of Protein Metabolism01:21

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Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
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Chronic Kidney Disease III: Interprofessional Care

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Chronic kidney disease (CKD) requires collaborative and comprehensive management. CKD progresses through stages and can lead to end-stage kidney disease (ESKD) if untreated. Interprofessional collaboration and patient education are crucial, enabling patients to manage their health and improve their quality of life.Diagnostic approach for chronic kidney diseaseThe diagnosis of CKD primarily focuses on the glomerular filtration rate (GFR), which assesses kidney function by measuring how well...
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Protein Absorption01:12

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Proteins in the gastrointestinal tract typically come from food, but they can also originate from disintegrated cells or secreted enzymes. In the stomach, the enzyme pepsin breaks down these proteins into polypeptides. The fragments then move into the duodenum as a semi-fluid mass called chyme. Pancreatic proteases, such as trypsin and chymotrypsin, and intestinal brush border enzymes like carboxypeptidases further dismantle the polypeptides into tripeptides, dipeptides, and free amino acids.
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Study Designs in Epidemiology01:20

Study Designs in Epidemiology

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Epidemiological study designs are fundamental tools for investigating the distribution, determinants, and control of health conditions in populations. They help researchers understand the relationships between exposures and outcomes, and they broadly fall into two categories: "observational" and "experimental" studies.
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Hormones and Bone Tissue01:17

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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Related Experiment Video

Updated: May 3, 2026

Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis
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Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis

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Protein supplements: do they alter dietary intakes?

Alistair R Mallard1, Rebecca T McLay-Cooke, Nancy J Rehrer

  • 1School of Physical Education, Sport, and Exercise Sciences, University of Otago, Dunedin, New Zealand.

International Journal of Sport Nutrition and Exercise Metabolism
|January 25, 2014
PubMed
Summary

High-protein supplements increase the percentage of protein in your diet but not total intake. Mixed macronutrient supplements increase total energy intake, suggesting dietary compensation occurs with protein supplementation.

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Last Updated: May 3, 2026

Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis
08:58

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Published on: January 5, 2017

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Area of Science:

  • Sports Nutrition
  • Dietary Supplementation
  • Human Metabolism

Background:

  • Understanding macronutrient intake is crucial for athletic performance and body composition.
  • The impact of different supplement types on total energy and protein intake requires further investigation.

Purpose of the Study:

  • To compare the effects of high-protein supplementation versus mixed macronutrient supplementation on total energy intake (TEI) and protein intake during an ad libitum diet.
  • To determine if protein supplementation leads to compensatory reductions in other food intake.

Main Methods:

  • Randomized, double-blind, crossover study design with trained male participants.
  • Two 2-week dietary interventions: high-protein (HP) and standard meal (SM) supplementation.
  • Baseline measurements followed by daily supplementation, with a 2-week washout period between interventions.

Main Results:

  • TEI was significantly greater with SM supplementation compared to HP supplementation (p = .043).
  • Protein intake as a percentage of TEI was higher with HP supplementation than baseline (p = .008), but absolute protein intake did not differ.
  • Absolute carbohydrate intake was greater with SM than HP supplementation (p = .006).

Conclusions:

  • High-protein supplementation increases the relative proportion of protein in the diet but does not increase absolute protein or energy consumption, indicating compensatory intake of other foods.
  • Mixed macronutrient supplementation increases TEI without altering the proportion of protein consumed.