Adequate calcium intake helps prevent the decrease in bone mass known as osteoporosis. The more a food is processed, the more the fiber is broken down and the lower the fiber content. Many foodstuffs that are excellent sources of fiber are economical and readily available. Among adults, the average consumption of dietary fiber is at present approximately 10 grams a day.
Lourdes: Dietary fiber is an important part of a healthful diet. Experts recommend that adults consume 20 to 35 grams of fiber a day. Kyra: But a daily intake of fiber that is significantly above that recommended level interferes with mineral absorption, especially the absorption of calcium. The public should be told to cut back on fiber intake.
Which one of the following, if true, most undermines Kyra's recommendation?