Diet Might Help Those Immobilized by Knee Osteoarthritis

WEDNESDAY, Dec. 21 (HealthDay News) — A diet consisting of eight
weeks of protein shakes and soup followed by adding low-calorie,
high-protein foods can help people with knee osteoarthritis lose weight,
which may lessen joint pain and improve their quality of life, a new study
finds.

This diet might also help people whose obesity makes it impossible to
exercise, the researchers added.

“Obese individuals with knee osteoarthritis should be urged to lose
weight,” said lead researcher Robin Christensen, head of the
Musculoskeletal Statistics Unit at The Parker Institute at Copenhagen
University Hospital at Frederiksberg in Denmark.

Samantha Heller, a dietitian and clinical nutrition coordinator at the
Center for Cancer Care at Griffin Hospital in Derby, Conn., said that “the
question this study brings up is whether the participants can maintain the
weight loss they achieved on a formula-based, very low-calorie, supervised
diet, in real life, with real food.”

For the study, Christensen‘s team followed 175 obese people suffering
from knee osteoarthritis. During the first eight weeks, the participants
had only the formula diet, called the Cambridge Weight Plan, which
includes soups and shakes and was limited to 800 calories a day. The
participants stayed on this diet for eight weeks.

Following this diet, the patients lost a lot of weight, but also
increased their bone mineral density, Christensen said.

During the next eight weeks, the participants continued the diet, but
increased their calories to 1,200 a day with one formula meal replaced by
low-fat, high-protein foods plus some carbohydrates.

Dieticians supervised the participants, Christensen noted.

During the first eight weeks, people lost an average of 26 pounds,
according to the study.

“This is achievable for all people with knee osteoarthritis, because 91
percent of all the people who started the trial completed 16 weeks of the
trial, so it’s feasible,” he said.

The findings appear in the Dec. 21 issue of the European Journal of
Clinical Nutrition
.

While the study’s main funding came from two Norwegian foundations, it
was funded in part by the makers of the Cambridge Weight Plan. Study
co-author Dr. Anthony Leeds is the medical director of the program. The
company paid for the dieticians and donated their products, Christensen
said.

The diets included the recommended daily intake of amino acids, fatty
acids, vitamins, and minerals, the researchers said. It also increased
levels of vitamin D, which is essential for bone growth. Levels of vitamin
B12 were also boosted, to improve nervous-system functioning of the
nervous system and blood production.

Losing weight helped more than 60 percent of the participants reduce
their knee pain and improved their ability to walk, the researchers found.

Osteoarthritis results in degradation of joints causing joint pain,
tenderness, stiffness and locking. According to Christensen, many
weight-loss diets decrease bone mineral density, which can weaken bones,
especially among people who can’t exercise.

The researchers have followed these patients for a year to see if they
have maintained their weight loss and whether their osteoarthritis has
improved, Christensen said. “The results are looking good,” he said.

Maintaining weight loss over time is the challenge, Heller said.

Without learning strategies for managing life’s daily obstacle course
of stressors, frustrations, temptations and social interactions, it is
highly likely that people who lose weight on a formula diet will regain
the weight they lost when they stop the program, she said.

“Losing weight is difficult at best, and for people who are overweight
or obese the struggle is complex and involves environmental,
physiological, psychological and health issues,” Heller said.

“People who are motivated to make lifestyle changes should work with
trained, accredited, health professionals such as a registered dietitian
and their physician,” she added.

More information

For more on osteoarthritis, visit the U.S. National Library of Medicine.

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