How do I increase insulin sensitivity?

Last Updated:

What is insulin sensitivity?

Definitions

Insulin sensitivity is a general phenomena in the body, and can be measured a few ways through studies.

The pancreas (an organ that regulates blood sugar) secretes insulin in response to high blood sugar, and cells (like muscle or fat cells) can absorb blood sugar when stimulated by insulin.

Insulin sensitivity is the relationship between how much insulin needs to be produced in order to deposit a certain amount of glucose. You are insulin sensitive if a small amount of insulin needs to be secreted to deposit a certain amount of glucose, and insulin resistant if a lot of insulin needs to be secreted to deposit the same amount of glucose.

Insulin sensitivity is seen as good as the opposite, insulin resistance, is a major risk factor for the development of Type II diabetes.

Types of Insulin Sensitivity

There are three main types of insulin sensitivity; peripheral insulin sensitivity, hepatic insulin sensitivity, and pancreatic insulin sensitivity.

Peripheral insulin sensitivity is how readily body cells in your periphery tissue, such as muscle and fat, can absorb glucose; either on their own (muscle can absorb glucose when contracted) or when insulin stimulates them. It is the most well-known form of insulin resistance.

Hepatic insulin sensitivity is related to the process of gluconeogenesis, the production of new blood sugar. Usually inflammatory factors prevent insulin from acting in the liver via inducing insulin resistance, and insulin's actions are unable to tell the liver to 'stop' producing glucose.[1][2]

Pancreatic insulin sensitivity is the functioning of the cells that secrete insulin, the beta-cells. If these are damaged or cannot function, insulin resistance can develop. This is more of a concern in disease states like Type I diabetes (insulin insufficiency)[3][4] or Cystic Fibrosis (where the function in physically hindered).[5]

Insulin sensitivity is how effective the body is as using insulin to reduce elevated blood glucose levels, with a greater efficacy being more 'sensitivity' and poorer efficacy being more 'resistant'. When the body becomes too poor at using insulin to reduce blood glucose levels, type II diabetes ensues

Lifestyle

Non-modifiable factors

It seems that insulin sensitivity is negatively associated with age[6] although these may be related more to lifestyle than to age per se.[7] The ability to reverse insulin resistance with exercise does not appear to be different between young and old.[6] Exercise tends to be recommended to older individuals to improve glucose metabolism.[8]

Modifiable factors

There is an association with obesity and insulin resistance, with insulin resistant individuals usually having more body fat. However, this also appears to be lifestyle related as increases in insulin sensitivity can occur without weight loss.[9] Some studies do note more drastic benefits in insulin sensitization in obese individuals, which is probably due to worse baseline statistics.[9]

Exercise

Aerobic Exercise (Ex. Jogging)

Aerobic exercise, or exercise that you can maintain for a prolonged period of time, seems to be able to acutely improve insulin resistance by increasing uptake of glucose into cells. It can increase insulin sensitivity immediately, as a session of 25-60 minutes (at 60-95% VO2 max) for 3-5 days.[10] Improvements can also be seen after a week of aerobic training, when doing mostly 2 short sessions of 25 minutes of walking at 70% VO2 max.[11] Interestingly, the opposite is also true. Voluntary restriction of activity or a drastic increase in sedentary activity can reduce insulin sensitivity in as little as 2 weeks.[12]

Over the long term, aerboic exercise done routinely can preseve beneficial changes in insulin sensitivity.[13]

Insulin sensitivity as a result of exercise can occur independent of weight loss.[9][14] This is not to say that aerobic exercise will not lead to weight loss, as it may.[15] The function of weight loss seems to be a blend of activity and diet, whereas insulin sensitivity increases could occur without changes in the diet.

In regards to hepatic insulin resistance, it has been seen over time periods of 12 weeks light aerobic activity[16][9] but studies lasting 1 week have sometimes noted no difference.[11]

Anaerobic Exercise (Ex. Weightlifting)

Strength exercises (lifting weights usually) is also associated with increasing insulin sensitivity as well as increased muscle mass.[17]

In persons with impaired glucose tolerance, more sets of an exercise tend to be more effective than single sets and higher intensities better than moderate.[18]

The general idea of exercise is that you want to have lean (muscle) mass, and you want it to contract somewhat regularly so it can take up glucose. The more properly functioning muscle mass one has, the better peripheral insulin sensitivity is

Supplementation

Supplements may be either supplements that directly act upon cells to induce insulin sensitizing effects (like resveratrol or carnitine) or may inhibit or otherwise delay carbohydrate uptake (like green tea catechins and perhaps chlorogenic acid)

Using some of these compounds in conjunction with diet/exercise techniques conducive to regaining insulin sensitivity would be advisable.

References
2.^Bastard JP, Maachi M, Lagathu C, Kim MJ, Caron M, Vidal H, Capeau J, Feve BRecent advances in the relationship between obesity, inflammation, and insulin resistanceEur Cytokine Netw.(2006 Mar)
3.^Cnop M, Welsh N, Jonas JC, Jörns A, Lenzen S, Eizirik DLMechanisms of pancreatic beta-cell death in type 1 and type 2 diabetes: many differences, few similaritiesDiabetes.(2005 Dec)
4.^Akirav E, Kushner JA, Herold KCBeta-cell mass and type 1 diabetes: going, going, goneDiabetes.(2008 Nov)
5.^Stecenko AA, Moran AUpdate on cystic fibrosis-related diabetesCurr Opin Pulm Med.(2010 Nov)
6.^Short KR, Vittone JL, Bigelow ML, Proctor DN, Rizza RA, Coenen-Schimke JM, Nair KSImpact of aerobic exercise training on age-related changes in insulin sensitivity and muscle oxidative capacityDiabetes.(2003 Aug)
7.^Karakelides H, Irving BA, Short KR, O'Brien P, Nair KSAge, obesity, and sex effects on insulin sensitivity and skeletal muscle mitochondrial functionDiabetes.(2010 Jan)
8.^Finucane FM, Sharp SJ, Purslow LR, Horton K, Horton J, Savage DB, Brage S, Besson H, De Lucia Rolfe E, Sleigh A, Martin HJ, Aihie Sayer A, Cooper C, Ekelund U, Griffin SJ, Wareham NJThe effects of aerobic exercise on metabolic risk, insulin sensitivity and intrahepatic lipid in healthy older people from the Hertfordshire Cohort Study: a randomised controlled trialDiabetologia.(2010 Apr)
9.^van der Heijden GJ, Toffolo G, Manesso E, Sauer PJ, Sunehag ALAerobic exercise increases peripheral and hepatic insulin sensitivity in sedentary adolescentsJ Clin Endocrinol Metab.(2009 Nov)
10.^Goulet ED, Mélançon MO, Aubertin-Leheudre M, Dionne IJAerobic training improves insulin sensitivity 72-120 h after the last exercise session in younger but not in older womenEur J Appl Physiol.(2005 Oct)
12.^Krogh-Madsen R, Thyfault JP, Broholm C, Mortensen OH, Olsen RH, Mounier R, Plomgaard P, van Hall G, Booth FW, Pedersen BKA 2-wk reduction of ambulatory activity attenuates peripheral insulin sensitivityJ Appl Physiol.(2010 May)
14.^Nassis GP, Papantakou K, Skenderi K, Triandafillopoulou M, Kavouras SA, Yannakoulia M, Chrousos GP, Sidossis LSAerobic exercise training improves insulin sensitivity without changes in body weight, body fat, adiponectin, and inflammatory markers in overweight and obese girlsMetabolism.(2005 Nov)
15.^Carr DB, Utzschneider KM, Boyko EJ, Asberry PJ, Hull RL, Kodama K, Callahan HS, Matthys CC, Leonetti DL, Schwartz RS, Kahn SE, Fujimoto WYA reduced-fat diet and aerobic exercise in Japanese Americans with impaired glucose tolerance decreases intra-abdominal fat and improves insulin sensitivity but not beta-cell functionDiabetes.(2005 Feb)
16.^van der Heijden GJ, Wang ZJ, Chu ZD, Sauer PJ, Haymond MW, Rodriguez LM, Sunehag ALA 12-week aerobic exercise program reduces hepatic fat accumulation and insulin resistance in obese, Hispanic adolescentsObesity (Silver Spring).(2010 Feb)
17.^Van Der Heijden GJ, Wang ZJ, Chu Z, Toffolo G, Manesso E, Sauer PJ, Sunehag ALStrength exercise improves muscle mass and hepatic insulin sensitivity in obese youthMed Sci Sports Exerc.(2010 Nov)