Another chapter in nutrition

Groceries in, garbage out, blood goes round and round…
"Endurance events are eating and drinking contests with some exercise thrown in too" Sunny Blende

We have already had a primer on running nutrition and via handouts you had recently, we looked at race day and race week meals to try in preparation. So now let’s talk about the food pyramid (now known as "my plate", new resource ideas for meals to help your running, salt, iron and regulation of “in’s and out’s” a bit. Your everyday training depends on knowing a bit more about fueling - especially as long runs get longer.

Let’s look at the macro nutrients in greater detail and see what you’ll be fueling yourself with in the coming months as you seek to keep yourself well fueled and injury free in training and attain ideal body type for your event. Running hard and all this training is not a diet program – I have said this many times. Yet you will find that over time your metabolic capacity increases and you are burning a lot of fat on your long runs, when they are done at aerobic pace. Therefore, body composition may actually subtly change even while you are eating a balanced and nutritious diet that feeds your energy level. Pretty cool stuff.

Three primary fuel types and all food from the new food pyramid fits into these neat slots as far as the body is concerned, yet not all foods are created equal. Carbohydrates, Lipids (or fats), and protein are the three types.

Fat: Sometimes a dirty word and thought of as something to avoid and yet, this is the most efficient fuel the body can have at 9Kal/gram, and it does not require the storage of water to be used in the body. We store most foods as glycogen and use it all over the body. Fat during aerobic exercise is converted to fuel and used for any endurance activity because it works but also because you cannot store all of the fuel you need to burn without using this fat. Unsaturated fat from plant products is ideal and not refined or hydrogenated fat is most healthy and burns in the body with fewer bi-products like free radicals.

Protein: Nearly everything of value in the body is built from proteins and this makes them simply too valuable to use a fuel. Skeletal muscle is built from a number of key proteins but even elements for your cell membranes and body hormones are made of protein. Daily intake is required and can be attained from animal and or vegetable sources. These proteins are made of amino acids and your body disassembles proteins it consumes and rebuilds good stuff from these amino acid chains. Several key amino acids are important to attain if we are on any kind of vegetarian or alternative diet. The most important of these amino acid chains is Omega 3.

Carbohydrates: Nearly everything else that is not made of protein or fat or a man made substance is a carbohydrate. Even sugar is a carbohydrate. While many people have profited from special diets that eschew “carbs” they are the body’s essential and most easily used fuel. The average American eats far more of the wrong kinds of carbs than they should, however the body will metabolize carbs the best and with fewer byproducts than any other energy synthesis. The trouble is that we cannot store all of the energy we need this way and so we start the running machine on carbs and efficiently transition mid run to fat metabolism as a fuel source.

What is bonk? You’ll see unprepared runners face bonk or “the wall” during a big event. It can be physically excruciating and mentally dehabilitating. Preparation can prevent this and you just need some understanding of physiology and prior practice to fend it off. Two experts define what this is pretty simply.
Sunny Blende, sports nutritionists writes, “The brain also does not store any glucose – as glycogen, as the muscles do – and is totally dependent on blood glucose for its energy supply. In order to function normally, the brain requires a relatively normal blood glucose level. So what happens to an ultrarunner when he or she is running hours and hours with an increasing demand for glucose? If our ultrarunner does not ingest adequate amounts of carbohydrate (glucose) along the way, hypoglycemia (low blood sugar) sets in. And with prolonged hypoglycemia comes central nervous system fatigue – the progressive shutdown of the part of the brain that drives the muscles. Bad news for attitude and bad news for performance.”

In one of Tim Noakes’s studies from The Lore of Running, he found that two percent of marathoners, six percent of those who ran 50 kms and 11 percent of those who ran 100 kms were hypoglycemic. He cites the symptoms as a “reduced ability to concentrate, a sudden feeling of weakness, and the intense desire to stop running. Typically, the athlete senses the impossibility of completing the race”. Sound familiar? Obviously foods containing glucose would have helped these athletes perform better, but an explanation of the mechanism of action might make this concept easier to understand. Again, Tim Noakes’s studies from The Lore of Running, “The main supplier of glucose into the blood is the liver. This happens directly from its own store of glycogen or indirectly by a process known as gluconeogenesis (the production of glucose by the liver from substances other than carbohydrates, for example, proteins). Training also helps the liver’s ability to produce glucose from circulating blood lactate. However, because the liver is so small compared to the body’s muscle mass and only stores about 250 - 500 calories of glucose, it could never keep up with the muscles’ demand for glucose when exercising hard or long. In a trained athlete, this amounts to three or four hours of running at a moderate pace. And the muscles are prevented from using too much circulating blood glucose in order to protect the brain. Fortunately our body has provided the muscles with other ways of obtaining glucose; namely a good supply stored in its own tissues and the ability to use fat as a source of energy. And remember, the supply stored in the muscles can be doubled if post-exercise carbs were consumed within thirty minutes or so. But even this generous supply will only last about five to six hours. The rate that the liver releases glucose and the muscles take it up during exercise is increased six-fold from a resting state. When tissues increase their rate of usage faster than the liver can produce it, blood levels fall and body function is impaired. In order to prevent brain drain and preserve our mind’s ability to think and strategize effectively in an ultra event, it becomes crucial to ingest carbohydrates during the race. If the muscles become fatigued, the brain will reduce the number of muscle fibers activated and in order to continue running, the ultrarunner will have to slow down. This is the body’s way of surviving. It may limit the runner’s physiological capabilities, but preserve the neurological function of the brain. Exhaustion, in this case, may be defined as a decrease in signals from the brain to the muscles, not a direct change in glycogen levels in the muscles - in other words, central fatigue.”

So the central governor steps in again to save the day and we learn that this phenomenon is preventable if we keep energy reserves up to meet the exertion demands. That requires you to test what kind of carbohydrates will digest easily for you while running. Gatorade, gel packets, bananas, chia seed, PB&J, fruit roll-ups and others have all been tried and many work well as long as they contain some water of their own and you keep your stomach lining wet w. a bit of fluids. Sunny Blende and others suggest that you might be able to train your body to utilize as much as 240 calories per hour while running (you’ll use more than this often, but that’s the breaks). The average gel packet is 100-150 calories each and 12oz of Gatorade is about 90 calories. So you can calculate what you’ll need and try to eat is small amounts spaced along the duration of your run.

Here is a link for some breakfasts with protein (a good time to get it as you metabolism is firing up and you’ll run on this later in the day) I love protein at breakfast because I am less hungry before lunch.


Here is a video with ideas about eating a snack an hour before a run and 3 ideas that each includes a healthy protein.

Here is an article by Mark Bittman and I like the guy for his simple style, ideas that involve less meat, and yet he is still eating right. He includes about 8 recipes in his article and beans given some attention as the powerhouse food they really are.
There are also links to some Mark Bittner food ideas on our face book site and as someone pointed out - he has started blogging for Runners World. Thanks Lori!

This link allows you to build menus by type and fulfill all the key nutrients in the process – it is free, but you have to register

This link lists what is in the meat and beans group and why you need it – along with a list of foods that will hold off anemia, or the low red cell count that gives rise to lethargy, low oxygenation and poor running performance.

Runners and athletes would want as many red blood cells (RBCs) as possible for best oxygen transport to your muscles. Recall that from a previous lesson that Coach Joe Vigil feels that many athletes, especially female athletes, need to monitor their bodies for signs of low iron or possible anemia. A normal range score of 37-43% RBC for hemocrit scores should be what you are expecting and a runner would be interested in being on the high end of this score for better oxygen carrying capacity. You can have your doctor test this blood value and including lean meat and beans in your diet helps fend off iron deficiency.

The Average American consumes approximately 3.6 grams of salt daily and current federal guidelines for sodium intake is 2.3 grams per day. The American Heart Association recommends 2 grams. What many folks miss at the cellular level is that both sodium and potassium are the two ions that your body uses every second of the day. While it is relatively simple to get your daily supply of sodium some folks do not get enough Potassium and you need 4.7 grams daily in order to function optimally. Having the optimum ratio of these elements lowers the incidence of cardiovascular disease and allows optimal membrane potential at the cellular level. Bananas, peaches, prunes, apricots, honeydew melon or cantaloupe, and OJ all contain good sources of potassium as well as whole grains, beans and many fresh meats.

Blood sodium must be maintained at a level of 135mmol/L and this value is typically easy to maintain without any dietary changes. For runners, the complication comes when someone would be running or walking slowly for a long time, while consuming a lot of water. This can create a condition called hyponatremia. While the article Responsible Drinking on the Trail (Dr. M Hoffman, Ultrarunning, March 2010) states that this condition has been responsible for five fatalities in the US and UK they also write that 30% of the runners at 2009 Western States 100 mile run, who participated in the author’s research, were positive for signs of hyponatremia.

For runners, hyponatremia means low salt. We lose salt in sweating and we can (with great effort) dilute the amount of salt that we have in our bodies by consuming large amounts of water. When you have a lot of water and not enough salt in the body, fluids begin to shift in your system and the results can be catastrophic and life threatening. You need not have a complete class in physiology to get a handle on how this works though. If you are sweating a lot, out for a long time, and throwing in the water as you go – then you need to keep your eye open for crucial signs of what is sometimes call ‘water intoxication”.

Dr. Hoffman list a number of Danger signs: [additions mine] “Your body would not lose the 2% of its weight you would expect on your longest run but would stay the same weight or gain weight during the run. Your body’s water is changing location and you’ll see swelling, [all over], but especially hands, feet, face – [rings and shoes may be tight.] You would see mental status changes as fluid causes brain cells to swell too. [This would look like stumble; mumble, fumble and you would have to look at their other symptoms to ensure you did not think - dehydration. Recall that people call this condition water intoxication because of the mental status changes you see in people.] This person may also feel sick, [feel nausea and be sloshing from all the water they are hauling in their stomach. Urine output would be beyond the “clear, constant and copious” realm that we expect in hydrated folks as the kidney are now doing all they can to solve a fluid overload condition.] This is an emergency medical condition that requires immediate attention and complications can include kidney failure.” [They need medical intervention and you take them off of water while you get them help.]

On a slight tangent but related to your groceries in garbage out theme, comes a question from a runner to the sports nutritionist at Runners World – you can view this online but I included the copy here as it relates to nutrition and is such a good question.

“Over the past couple of months, I've been having to go "number 2" during most of my morning runs. I used to be able to go before my runs without much of an issue. Now I try to go but nothing happens. I eat a healthy diet, for the most part, with fruits and veggies, and get about 30 grams of fiber each day; drink 60 to 70 ounces of water; and seem to get the right amounts of calories (2,500), carbs (60 to 70%) and proteins (100 grams per day). I run about 35 miles a week and I am 5'10" and 155 pounds. Am I just eating too much? Any suggestions? – Joseph”

Joseph, a few observations:
“You say you eat lots of fruits and vegetables and 30 grams of fiber per day. Certain fibers are more helpful with laxation, such as bran-type cereals. In addition, consider swapping one of your fresh fruit choices for four or five dried plums, especially at night before bed.
The recommended fluid intake for adult men is 125 ounces per day, at rest, and more for exercise, so if you are consuming 30 grams of fiber and not enough fluid, that may also be part of the problem; consider increasing your liquids intake.
And based on your diet breakdown (60 to 70% carbs, or 375 to 437 grams per day, and protein at 100 grams per day) your diet may be too low in fat. Fat is important as a lubricant. So you may want to cut the carbs slightly and increase the fat, through nuts and nut butter, or olive oil on those vegetables, or guacamole.
Last but not least: Before bedtime, try a small bowl of All-Bran, Bran Buds, or Fiber One with a few dried plums and 2 tablespoons of nuts. Make sure you have a large glass of water (about 16 ounces) with this.
Hopefully this will get you back to running your route, and not to the bathroom!”
Leslie

Have a question for Leslie? E-mail her. (Please write "Ask the Sports Dietitian" in the subject line.) NOTE: Due to the volume of mail, we regret that Leslie cannot answer every e-mail.
And check out Leslie's newest book, Sports Nutrition for Coaches, on sale now.

The item that I would say Leslie neglected to mention is something called the gastrocolic reflex. We all have this, but many choose to not tune into it. Once our runner, Joseph tries Leslie’s suggestions he will not be able to ignore it! Each day your gastrointestinal system sort of “wakes up” and contracts in a mechanical wave that we call peristalsis and this reflex occurs when food or fluid (often warm coffee or tea) first comes into the stomach. When you listen to your body, you’ll feel this occur and you can sit down to have a bowel movement right away, because your body has this preparatory reflex for a purpose. Following this hint from your gut will train your bowel to go before your run (or your race) and save you a great deal of anxiety along with improving your quality of life. Laugh, because it is good to do so – but then try it because it works.

I’ll have a few handout ideas for you regarding micro meal scheduling and training meals. Additionally, I will be reading a new book this year on nutrition and I encourage you to as well – it sounds great. Matt Fitzgerald’s Racing Weight – How to Get Lean for Peak Performance. There is very little on this subject currently and this work has already seen high acclaim from coaches in our sport, check it out.