Hunger, Hormones, and Appetite.
Idaho Kettlebell Strength and Conditioning
Jim Beaumont CSC, Certified Sport Nutrition Specialist, Primal Blueprint Certified Expert. (208) 412-6079 www.idahokettlebells.com
This is a brief overview of the way the hormones insulin, leptin, and cortisol work and how they relate to appetite and body composition.
Hormones: A complex subject, but let’s focus on a few basics for now.
This brief summary will be in the simplest, plainest terms, and be provided within the context of fitness and body composition. It is not presented to treat any medical condition, or assist with any serious health concerns. For those concerns, anyone…with a shred of sense, will consult a licensed physician, not a strength coach and sport nutrition specialist.
Many nutrition programs focus on calories, strict meal plans, and ratios of macronutrients (carbs, proteins and fats). This is partly due to a lack of knowledge of some basic hormones, but it also reflects on the fact that humans’ hormonal responses to types of food, or the lack of it is a complex and confusing subject. It is a lot easier for a fitness professional to give a strict caloric number than explain this relationship.
Hormones are Chemical Messengers.
Things like fat storage and muscle building are controlled by hormones. For now, we are going to focus on only a few: Insulin, leptin and cortisol. These three are key hormones that must be addressed when discussing fitness or body composition. Every bite of food you eat affects your hormones. Calories are much less important than hormonal response.
Insulin
Insulin is there to maintain blood sugar levels and body fat. It also works to shuttle nutrients throughout your cells for repair and maintenance (and for building muscle and recovering from hard training).
When it comes to body composition, consider insulin your fat-storage hormone. It converts excess blood sugar into fat. Any blood sugar level above what your body requires causes your insulin levels to spike, and excess blood sugar to immediately be stored as fat.
Example:
Let’s say my blood sugar is a number, 100 points. My body is happy there. It doesn’t want to be less or more. If my blood sugar raises, say to 200 points after eating a Snickers bar or slice of bread, my body will secrete insulin to bring the blood sugar back down to 100, where it wants to be.
So, my blood sugar went from 200 down to 100. Where did that extra 100 points go? It went straight to my fat cells – into storage- for later in case I need it for energy. The problem is, most people don’t need the extra energy. They are storing fat for a famine…that never comes.
Insulin makes fat: That’s what it does. More insulin, more fat storage. Less insulin, less fat storage. Insulin is elevated for approximately three hours after eating or drinking anything that causes insulin levels to rise. High insulin levels stop any fat burning and keep your body in fat storage mode continually.
If we eat sugary carbs (all carbs are sugars) on a regular basis, our body has to constantly secrete insulin (and store fat) to deal with the excess blood sugar. The better our body responds to insulin and the better it is at regulating blood sugar, the less fat we store.
In other words, the more insulin sensitive we are, the less fat we store and the better we can get nutrients where they need to be.
The problem is that our insulin sensitivity decreases the more we bombard ourselves with excess sugar. As a result of this, more insulin is secreted and the more fat is stored.
In the case of type II diabetes, type II diabetics are not able to make enough insulin to keep blood sugar at healthy ranges, and must get shots of insulin to keep the sugars down. Diabetes is one of the world’s biggest health problems and ties into obesity and high blood pressure. Just Google “insulin resistance” with heart disease, high blood pressure, diabetes, etc. and you will find connections.
Increasing insulin sensitivity means less fat storage, better nutrient transport, and more stable blood sugar.
Leptin
Leptin lets our bodies know how much “fuel” we have stored up for energy or tissue repair. It also helps to regulate appetite.
Leptin is like the gas gauge in your car. It signals that you have enough nutrients to conduct your activities or to build muscle. If your leptin sensitivity is high, then your gas gauge is working correctly and your body knows you have enough fuel. If not, you think you need to add fuel, because our bodies are programmed to keep the tank full. Thus, you are hungry when you don’t need to be.
In normal, healthy people if leptin is present and receptors are sensitive, feeding is inhibited. Leptin also helps your body access stored bodyfat as fuel…if you take more than four hours between meals. This is because insulin levels will be elevated after eating, and the hormone insulin is thought to block leptin.
In essence, if you go more than four hours between meals, your body gets a “snack” on stored bodyfat. Taking 6-8 hours between meals is preferable.
The more often we eat, the less sensitive we are to leptin. The receptors “wear out.” Your “gas gauge” doesn’t register correctly.
I practice intermittent fasting for up to 24 hours about every week or so in order to increase my leptin sensitivity (more on that another time). I don’t blanket-recommend this, however. This is a personal choice.
Having a basic understanding of these hormones will help provide a reference for the nutritional recommendations I make. This is useful for those who want to understand the reasons I recommend things like banning grains, sugars, dairy, and excessive fruits from your diet, and why I do not subscribe to the idea you need to eat frequently throughout the day, like many fitness personalities recommend.
Cortisol
Think of cortisol as your body’s “stress hormone.” This can be a good thing or a bad thing. When you are placed in a stressful situation, cortisol elevates in order to give you more focus, energy, mental clarity, and injury resistance. This is supposed to help us get through a short-term crisis. We can handle it in that context. We are simply not built to have this hormone “turned on” all day, every day as many of us do.
Chronically elevated cortisol levels induce insulin resistance, poor carb tolerance, increase hunger, and increase abdominal fat relative to other areas of the body. Ultimately, this leads to poor glucose tolerance and more hunger, which leads to more indulging and a reduced ability to handle the food (especially carbs), which leads to elevated blood sugar and weight gain.
Elevated cortisol levels are caused by many things in society that our ancestors simply didn’t have to deal with. This puts us at odds with our DNA. These things include:
* Inflammatory diet. A typical American gets about 70% of calories from foods that that were not available 100 years ago.
* Constant exposure to screens
* Stressful work conditions, commutes, and 24/7 availability
* Exposure to bright light after dark
* Over exercising
* Toxic relationships
* Chronic health conditions
* Social media and 24 hour, instant news media
* Lack of quality sleep
Tips to Increase Insulin Sensitivity (Things you can start doing immediately).
1. Reduce total carbohydrate load to 50-150grams per day, with these carbs coming from vegetables and limited fruit. If fat loss is a goal, keep that on the lower end of the scale (50-100grams per day). A competitive athlete or bodybuilder can handle more than this, because those carbohydrates are used as fuel.
2. Do not start your day with a carb source. This is when your body is the least insulin sensitive. This sets up a roller coaster of high and low blood sugar throughout the day. Instead, start with meat, eggs, fish and nuts.
3. Take fish oil.
4. Make sure you are getting enough magnesium and zinc.
5. Try to get the majority of your carbs after training for the day.
6. Start each meal with a protein source.
7. Don’t drink calories. Your body expects to chew food in order to receive nutrients. The only general exception to this are things like bone broth (or a post workout shake for additional nutrients for someone that does not have a fat loss goal).
8. Eliminate all grains and sugar…and DO NOT substitute with gluten free alternatives.
9. Get 8-10 hours of sleep per night. Repeated nights of poor sleep can severely compromise insulin and leptin sensitivity and elevate cortisol levels.