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A Low Glycemic Index Diet for Prevention of Glucose Intolerance During Bed Rest

Not Applicable
Completed
Conditions
Glucose Intolerance
Interventions
Dietary Supplement: Moderate glycemic index hospital diet
Dietary Supplement: Low glycemic index, pulse-based diet
Registration Number
NCT03595943
Lead Sponsor
University of Saskatchewan
Brief Summary

Recovery from surgery, injury or illness might require periods of bed rest in-hospital or at home. Bed rest may be needed for recovery but also has negative consequences. Prolonged bed rest reduces the ability of muscle to take up sugar from the blood, and increases blood levels of sugar and fat which may actually delay recovery. Bone starts breaking down when there is very little skeletal stimulation or 'stress' that typically occurs with walking. Bed rest stiffens arteries which may increase blood pressure. Different diets may influence the extent of harmful effects to muscle, bone and arteries during bed rest. This study compares a diet with increased plant sources (i.e. lentils, chickpeas, beans and peas) to a typical hospital diet (mostly animal sources and foods high in refined sugar) on blood, arteries, muscle and bone during bed rest. The investigators will test six healthy adults before, during and after two periods of 4-day bed rest, one when they eat a typical hospital diet, one with a diet containing more plant sources. The investigators will learn more about the effects of diet during bed rest and be able to make recommendations about diets to help ensure healthy recovery for individuals requiring bed rest.

Detailed Description

Many medical conditions and interventions require periods of bed rest in order to maximize recovery and restore optimal physical function. Unfortunately, muscle becomes glucose intolerant, bone starts to break down, and arteries become stiffer during sustained periods of chronic inactivity, such as bed rest. Elevation of blood glucose during hospital stays results in increased morbidity, mortality, length of stay and costs. Components of the typical Western diet (refined carbohydrates and protein from animal sources common in hospital foods) induce glucose intolerance, bone catabolism, and arterial stiffening; plant-based proteins may not have the same negative impact. Pulses (i.e. low fat legumes: lentils, chickpeas, beans, peas) contain carbohydrate with a low glycemic index, and do not substantially increase blood glucose levels. At the same time, they are high in protein, but do not contain the same sulphur-containing amino acid profile as animal proteins that induce bone resorption. Pulses are, therefore, a potential 'super food' to mitigate many of the negative impacts associated with required bed rest following medical illness.

The study purpose is to determine the effects of a pulse-based diet compared to a Western diet of typical hospital foods on glucose tolerance, bone catabolism, and arterial stiffening during bed rest. The investigators hypothesize that a pulse-based diet will be superior to a typical Western diet for preventing glucose intolerance, bone catabolism, and arterial stiffening during sustained bed rest.

Six healthy adults will take part in a cross-over study where they will be randomized to four days of bed rest while on a pulse-based or Western diet, have a one month wash-out and then cross-over before another four days of bed rest with the other diet. Immediately before and after bed rest (i.e. the first morning after the last night of bed rest), oral glucose tolerance tests will be conducted to assess glucose tolerance and insulin sensitivity (i.e. markers used to assess diabetes risk). At the same time points, fasting blood samples will be collected for lipid assessments. Urine will be collected for assessment of bone catabolism (via measures of N-telopeptides: a by-product of collagen from bone which appears in the urine when bone is breaking down). Blood pressure will be evaluated every two hours during bed rest days from 9am to 9pm. Arterial stiffness (measured by the gold-standard technique of pulse wave velocity using applanation tonometry) and beat-by-beat blood pressure will be used to assess blood vessel function before and after four days of bed rest.

This study will inform improved hospital diets and nutritional habits of patients to prevent or offset negative health implications during periods of bed rest that may be required either in-hospital, long-term care or at home as part of standard medical care.

Recruitment & Eligibility

Status
COMPLETED
Sex
All
Target Recruitment
6
Inclusion Criteria
  • Healthy
Exclusion Criteria
  • Diabetic
  • Vegetarian
  • Food allergies

Study & Design

Study Type
INTERVENTIONAL
Study Design
CROSSOVER
Arm && Interventions
GroupInterventionDescription
Regular hospital dietModerate glycemic index hospital dietModerate glycemic index diet based on hospital menus
Low glycemic index dietLow glycemic index, pulse-based dietLow glycemic index pulse-based diet (i.e. beans, peas, lentils, chickpeas)
Primary Outcome Measures
NameTimeMethod
Glucose area under the curveChange from baseline to 4 days

glucose area under the curve from 2-hour oral glucose tolerance test

Secondary Outcome Measures
NameTimeMethod
Fasting insulinChange from baseline to 4 days

Fasting Insulin from serum

Fat massChange from baseline to 4 days

Fat mass from dual energy X-ray absorptiometry scans

Fasting cholesterolChange from baseline to 4 days

Fasting cholesterol from serum

Fasting triglyceridesChange from baseline to 4 days

Fasting triglycerides from serum

Bone resorptionChange from baseline to 4 days

Urinary n-telopeptides

Fasting HDL-cholesterolChange from baseline to 4 days

Fasting HDL-cholesterol from serum

Arterial stiffnessChange from baseline to 1, 2, 3, and 4 days

Arterial stiffness assessed by tonometry

Insulin area under the curveChange from baseline to 4 days

Insulin area under the curve from 2-hour oral glucose tolerance test

Fasting LDL-cholesterolChange from baseline to 4 days

Fasting LDL-cholesterol from serum

Systolic Blood pressureChange from baseline to 1, 2, 3, and 4 days

Beat-by-beat blood pressure measurement

Fasting glucoseChange from baseline to 4 days

Fasting glucose from serum

Lean tissue massChange from baseline to 4 days

Lean tissue mass from dual energy X-ray absorptiometry scans

Diastolic blood pressureChange from baseline to 1, 2, 3, and 4 days

Beat-by-beat blood pressure measurement

Trial Locations

Locations (1)

College of Kinesiology, University of Saskatchewan

🇨🇦

Saskatoon, Saskatchewan (SK), Canada

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