In trying to reduce the amount of fat in their diet, on average people have decreased their consumption of red meat by one-half in the last two decades. However, on average those who have reduced their consumption of red meat actually consume substantially more fat than those who have not.
The statement 'People who reduce their consumption of red meat tend to consume as much of other foods that are high in fat as do those who have not reduced their consumption of red meat' most helps to resolve the apparent discrepancy described above.