No matter how busy you are, eat lunch before 3 p.m., a Spanish study suggests. Researchers placed a group of women on a diet for 20 weeks; half ate lunch before 3 and half consumed their midday meal after 3. Although both groups’ daily caloric intake, time spent exercising and sleeping, and appetite hormone levels were the same, those who lunched late lost about 25 percent less weight than earlier eaters. Being European, lunch was the biggest meal of the day for these women, constituting 40 percent of their calories for the day, so consider slimming down dinner in addition to watching the clock.
The new guidelines encourage eating more nutrient-dense food and beverages. Many of us consume too many calories from solid fats, added sugar and refined grains. The guidelines promote a diet that emphasizes vegetables, fruits, whole grains, fat-free or low-fat dairy products, seafood, lean meat and poultry, eggs, beans and peas, and nuts and seeds.
Here, too, body size is the main difference between the needs of males and females. Despite all the hype about high-protein diets, our protein requirements are really quite modest — only about a third of a gram per pound of body weight. For a 125-pound woman, that amounts to about 42 grams, for a 175-pound man, 58 grams. That's a tiny difference, just about half an ounce a day.
A 45-year-old woman who gets less than 30 minutes of daily physical activity in addition to her normal routine should consume six ounce of grains; two and a half cups of vegetables; one and a half cups of fruit; three cups of milk; five ounces of meat and/or beans; five teaspoons of oil; and just 195 calories of additional fat and sugar. With a higher level of daily activity (30 to 60 minutes), this woman would be able to consume a little more in certain food groups: her fruit intake could rise to two cups; meat and beans to five and a half ounces; oils to six teaspoons; and extra fat and sugar to 265 calories.
As the science of nutrition continually evolves, researchers recognize that nutrients needed to maintain a healthy lifestyle must be tailored to the individual for maximum effectiveness. Recognizing that people are not all alike and that one size does not fit all when it comes to planning and achieving a healthful diet, the Institute of Medicine's dietary guidelines, titled "Dietary Reference Intakes for Macronutrients," stress the importance of balancing diet with exercise and recommends total calories based on an individual's height, weight and gender for each of four different levels of physical activity.
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