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If we want avoiding is a suitable alternative for If we want to avoid (line 4).
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by 2050 (line 4) means that 2050 is the deadline.
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The idea expressed by should in we should inform the population (lines 4 and 5) can also be expressed by ought to.
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In some pathological eating disorders (lines 6 and 7), some means a few.
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In line 8, the s in diets is pronounced as the s in foods.
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In paragraph 1, according to some doctors, fad diets have recently contributed to making the obesity issue much worse.
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Both yet and nevertheless express the same idea as However in paragraph 2.
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The nutritional content of these fad diets is so complex because they are based on a scientific theory.
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rarely (line 20) means seldom.
According to the text: 