by Nancy Clark, MS, RD, CSSD
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Food consumption affects the central clock in your brain. This clock controls circadian rhythms and impacts all aspects of metabolism, including how your organs function. Restricting daytime food and eating in chaotic patterns disrupts normal biological rhythms. The end result: erratic meal timing can impact the development of cardiovascular disease (CVD), type-2 diabetes and obesity.
This article offers food for thought from the American Heart Association’s Scientific Statement on Meal Timing and Frequency: Implications for Cardiovascular Disease Prevention. (Circulation, Jan 30, 2017). The information is particularly important for runners, because training schedules can really upset standard meal times. Plus, most of us want to live a long and healthful life. Hence, we need to pay attention to meal timing—starting at an early age. Children and adolescents who skip meals have a higher risk of developing health issues (higher BMI, more belly fat, higher serum insulin and blood glucose). Not a good start for a long and healthy life. (Parents take note: Be responsible with family meals!)
Veteran runners also want to stay healthy. In 2014, 14.5% of the US population was 65 years or older. Over the next 25 years, older Americans are expected to grow to 22% of the US population. We need to outlive the diseases of aging. That starts with fueling wisely on a regular schedule and enjoying regular exercise!
Breakfast: Is it really the most important meal of the day?
If you define breakfast as eating 20% to 35% of your daily calories within two-hours of waking, about one-fourth of US adults do not eat breakfast. This drop in breakfast consumption over the past 40 years parallels the increase in obesity. Breakfast skippers tend to snack impulsively (think donuts, pastries, chips and other fatty foods). They end up with poorer quality diets and increased risk of diabetes, heart disease, high blood pressure and overweight/obesity.
Eating a wholesome breakfast starts the day with performance enhancing fuel at the right time for your body’s engine. If you run in the morning, fuel-up by having part of your breakfast before you workout (a banana, for example) and then enjoy the rest of the breakfast afterwards (oatmeal, almonds and yogurt). This will help you get more out of your workout, improve recovery—and click with your natural circadian rhythms.
Meal Frequency: Is it better to eat 1, 3. 6, 9 or 12 times a day?
In terms of weight, eating 2,000 calories divided into 1, 3, 6, 9, or 12 meals doesn’t change your body fatness. In a study where breakfast provided 54% of the day’s calories and dinner only 11% of calories—or the reverse, the subjects (women) had no differences in fat loss. Yet, in terms of cardiovascular health, the big breakfast led to significant reductions in metabolic risk factors and better blood glucose control. The bigger breakfast matched food intake to circadian rhythms that regulated metabolism.
Runners who skimp at breakfast commonly get too hungry and then devour way too may calories of ice cream and cookies. If they do this at night, when the body is poorly programmed to deal with an influx of sweets, they are paving their path to health issues. Hence, if you are eating a lot of calories at night, at least make them low in sugary foods, to match the reduced insulin response in the evening. This is particularly important for shift workers, who eat at odd hours during the night and tend to have a higher rate of heart disease.
Should you stop eating after 8:00 PM? There’s little question that late-night eating is associated with obesity. Research with 239 US adults who ate more than one-third of their calories in the evening had twice the risk of being obese. Among 60,000 Japanese adults, the combination of late-night eating plus skipping breakfast was associated with a greater risk of diabetes, heart disease and obesity. A study with 2,200 US middle-aged women reports each 10% increase in the number of calories eaten between 5:00 PM and midnight was associated with a 3% increase in C-reactive protein, a marker of inflammation. Inflammation is associated with diabetes, CVD and obesity. The wise runners do most of their fueling in the earlier parts of the day.
The best plan: Plan to eat intentionally.
Failing to plan for meals can easily end up in missed meals, chaotic fueling patterns and impaired health, to say nothing of reduced performance. If you struggle with getting your food-act together, consult with a sports dietitian who will help you develop a winning food plan. Use the referral network at www.SCANdpg.org to find a local sports RD.
Instead of holding off to have a big dinner, enjoy food when your body needs the fuel: when it is most active. If you worry you’ll eat just as much at night if you eat more during the day (and as a result, you’ll “get fat”), think again. Be mindful before you eat and ask yourself: Does my body actually need this fuel?
Most runners can and should enjoy at least 500 to 700 calories four times a day: breakfast, early lunch, second lunch, and dinner. To overcome the fear that this much food will make you fat, reframe your thoughts. You are simply moving the calories in your pre- and/or post-dinner snacks into a substantial and wholesome second lunch (such as a peanut butter-honey sandwich, or apple, cheese & crackers.). The purpose of this second lunch is to curb your evening appetite, refuel your muscles from your workout earlier in the day (or fuel them for an after-work run) and align your food intake to your circadian rhythms. Give it a try? Even runners cannot out-train a poorly timed diet.
Sports nutritionist Nancy Clark MS RD CSSD has a private practice in the Boston-area (Newton; 617-795-1875), where she helps both fitness exercisers and competitive athletes create winning food plans. Her best-selling Sports Nutrition Guidebook, and food guides for marathoners, cyclists and soccer are available at nancyclarkrd.com. For workshops, see www.NutritionSportsExerciseCEUs.com.
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