One pound of fat contains approximately 3,500 calories, so to lose one pound a week, a person should consume approximately 3,500 fewer calories per week. This can be done by reducing the daily intake by 500 calories per day (500 x 7 days will provide a deficit of 3,500 calories per week). To lose 2 pounds per week, a deficit of 1,000 calories per day is required.
If this seems impossible, remember that physical activity also contributes significantly to weight loss. The deficit of 500 to 1,000 calories can come from a combination of increased physical activity and reduced intake on a daily basis. Of course, this will vary depending on the level of spinal cord injury.
What is a desirable weight?
Presentation given on June 13, 2006, by Vickeri Barton, RD, CD Dietitian, Harborview Medical Center.
Right after injury, people lose a significant amount of weight. "It's not uncommon for a young man to lose 40 lbs. while in the hospital," Barton reported. "And a lot of that is the initial loss of muscle mass due to inactivity. But before going home, weight starts to go up again."
While there are no weight guidelines specifically for people with SCI, weight charts for the general public, such as those from life insurance companies (see Desirable Weight Charts pdf, 57kb), can be adjusted for use with the SCI population. To compensate for a reduction in muscle mass, the general rule is to subtract 5-10% for paraplegia and 10-15% for tetraplegia (quadriplegia). For example, if the desirable weight for a medium-build, 5-foot 11-inch man is around 160 lbs., the recommendation of a similar-size man with paraplegia would be 5%-10% less, or 144 lbs. to 152 lbs. For a man with tetraplegia, desirable weight would be even lower-136 lbs. to 144 lbs.
Weight is only one factor, however. More important is the amount of fat a person is carrying around. This is often determined using the body mass index (BMI), calculated by dividing your weight by your height (see BMI chart pdf, 75kb). But Barton doesn't use this on SCI patients, "because of the research evidence that BMI often underestimates body fat in SCI." A recent study compared 19 males with SCI to 19 non-injured males matched for age, height and weight. (1) While the groups had similar BMIs, subjects with SCI averaged 8.9 kg less lean (muscle) mass, 7.1 kg more fat mass, 9.4% more body fat, and 3.7 kg more fat in the trunk than the non-injured controls. Fat mass refers to an actual measurement of the quantity of fat described by weight of the mass, whereas percent body fat refers to that amount of fat mass in comparison with the percent lean muscle mass and percent water the human body contains.
Estimating Calorie Needs
"People with SCI often ask me how many calories they need," Barton said. A formula to calculate calorie needs in SCI was developed in a 1985 study (2) that is still quoted widely today:
Persons with paraplegia: 27.9 calories times body weight in kg. (1 kg. = 2.2 lbs)
Persons with tetraplegia (quadriplegia): 22.7 calories times body weight in kg.
If you are already overweight, the calculation should be based on your desirable weight, not your current weight. For example, a person with tetraplegia (quadriplegia) whose desirable weight is 165 pounds, or 75 kg, needs 1703 (75 x 22.7) calories per day. A 165-pound person with paraplegia would need 2093 calories per day. Unfortunately, "this formula doesn't take into account your gender, age or activity level," Barton said. "You probably need 200-300 fewer calories per day if you're 50 rather than 20 years old. And you use more calories with activity." Even the amount of air in wheelchair tires can affect energy expenditure (less air makes it harder to push) and calorie needs.
Tips for preventing weight gain:
Avoid foods that are high in fat and sugar.
Reduce how much alcohol you drink.
Avoid stress, frustration, and boredom.
If you are depressed, seek medical treatment.
Avoid a sedentary lifestyle by increasing your activity level:
Perform aerobic exercise for at least 30 minutes a day, 3 times a week .
Increase physical activity by walking rather than driving.
Climb stairs rather than using an elevator or escalator.
Always talk to your health care provider before starting an exercise program.
FAD DIETS
A fad diet is one that makes unrealistic promises. Most fad diets are very low in carbohydrates and in calories, causing fluid loss from the body, which indicates a loss of weight on the scale. Once the body gets rehydrated with water, the weight will come right back.
Evaluation of a fad diet:
Is the diet medically and nutritionally safe? Get an opinion from a physician and a registered dietitian.
Red flags for fad diets include: overemphasis on a specific food group or groups, limited food choices, and a "calories do not count" approach.
These are ways to decide whether to use a diet or not. If there is no nutritionally or medically reliable information provided, and if there are no statistics to back the claims, then it is not a good diet to consider. Remember, if it sounds too good to be true, then it probably is.
SUMMARY
For weight loss to be successful, here is a summary of basic guidelines:
Aerobic physical activity will assist in increasing muscle tissue which will burn more calories. You should plan on 20-minute sessions at least 3 times per week.
Gradual changes in eating habits will help encourage a permanent lifestyle change.
A slow weight loss of 1 or 2 pounds a week, until the desirable body weight is reached, is best.
References
1. Healthy body mass index values often underestimate body fat in men with spinal cord injury. Jones LM, Legge M, Goulding A. Arch Phys Med Rehab 2003;84(7): 1068-71
2. Energy expenditure after spinal cord injury: an evaluation of stable rehabilitating patients. Cox SA, Weiss SM, Posuniak EA, Worthington P, Prioleau M, Heffley G. J Trauma 1985;May 25(5):419-23.
Source - adapted from: www.nlm.nih.gov/medlineplus/ency/article/001940.htm
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