For those of you who know me, you know I have struggled to gain lean mass. In fact, i've struggled to gain any muscle at all. My last 'add lean mass' run, while I admittedly didn't stick to my plan 100%, was a total failure IMO as I didn't gain any noticeable muscle but did gain a lot of fat.
This really made me start questioning things. How could this be possible? I can understand the fat gain if the diet gets sloppy and cardio is neglected (both of which happened on my last run)... but I couldn't understand why i'd gain NO muscle. I met all the following criteria:
- trained sufficiently and with intensity, i.e. gave my body a reason to grow
- hit my macros (went over if anything)
- sufficient protein, carbs and fat - definite caloric surplus (evident in the fat gains)
- sufficient sleep
- bloodwork shows 'within normal range' test levels
I started thinking about insulin resistance. Without going too much into HOW we become insulin resistant (that's another topic that deserves it's own thread), suffice it to say a leading culprit is poor diet (high fat/sugar/processed calorie dense food) and no exercise. Well, that pretty much sums up my life throughout my 20's.
Insulin resistance is a 'condition' whereby our cells become resistant to insulin. Insulin is a hormone that's responsible for shuttling nutrients into our cells. Basically, we eat - let's say carbs for an easy example - carbs are eventually broken down into their simplest form, glucose. Our blood glucose levels rise. The pancreas is triggered to secrete insulin to 'clean up' the glucose in our bloodstream, shuttling it to be stored into our cells - muscle (as glycogen), liver (as glycogen), and fat (as tryglycerides). You can see how a constant diet high in fat and carbs (not to mention caloric surplus) can keep blood glucose levels high, requiring insulin to continuously be released. Continuous circulating insulin can, over time, cause cells to become insulin resistant.
This made perfect sense for my case - muscles weren't growing in proportion to my training because they weren't benefitting from insulin in my bloodstream. i.e. glucose uptake in the cells was limited. But why would I so easily store bodyfat then, if cells have become resistant? Isn't it an 'all or none' type of thing? Then I came across this little read, which was like an epiphony for me:
Once established, insulin resistance would result in increased circulating levels of insulin. Since insulin is the primary hormonal signal for energy storage into fat cells, which tend to retain their sensitivity in the face of hepatic and skeletal muscle resistance, IR stimulates the formation of new fatty tissue and accelerates weight gain - Elvira Isganaitis; Robert H. Lustig (2005). "Fast Food, Central Nervous System Insulin Resistance, and Obesity". Arteriosclerosis, Thrombosis, and Vascular Biology
This spoke volumes to me. This answers my questions. Now it makes perfect sense as to why i'd add fat but not muscle, even though the environment for muscle growth is present. But finding this was the easy part. 'Fixing' it is a whole different animal. So what can we do to decrease insulin resistance, or better put - increase insulin sensitivity?
- limit sugar intake. This is a no brainer. Spiking BGL's and the subsequent insulin response is counter productive. So forget your PWO 'fast acting carbs' - they will only hurt you in this case.
- limit overall carb intake. If you're trying to lower your resistance to insulin, then eating 400g of carbs per day isn't going to help, even if they're the cleanest most complex carbs ever.
- extend the time between when your workout ends and you have your PWO meal, particularly carbs. Studies have shown an increase in insulin sensitivity when food isn't eaten immediately PWO.
- Exercise - duh
- Fasting - I'll be exploring this (again), with the new goal of increasing my sensitivty to insulin. It's logical to think that keeping BGL low and insulin supressed will, over time, increase sensitivity
- Keep fat intake low - I don't mean 10g a day, just be moderate. Personally, I don't let fat make up more than 15% of my diet.
- DO supplement with fish oil. Omega-3 fatty acids have been shown to have a positive effect in increasing insulin sensitivity
I will add more as I think of them/research further. Hopefully this will get a dialogue going which will prompt more questions... and responses. I hope this helps some of you with your own confusion on the topic.