The Claim
In sedentary individuals, the maximum capacity of insulin to suppress lipolysis is preserved, but the sensitivity of adipose tissue to insulin, defined as the insulin concentration required to achieve half-maximal suppression of lipolysis, is reduced by approximately 10-fold, indicating that insulin resistance in adipose tissue arises from impaired signaling proximal to the insulin receptor rather than from defects in downstream signaling pathways.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In people who are physically inactive, insulin can still fully stop fat breakdown, but it requires about 10 times more insulin to do so, which means the problem lies in how insulin signals at the cell surface, not in later steps of the process.
See the scientific wording
The maximum effect of insulin on suppressing fat breakdown (antilipolysis) is preserved in sedentary individuals, but its sensitivity—the insulin concentration needed to achieve half-maximal effect—is reduced by approximately 10-fold, indicating that insulin resistance in adipose tissue is primarily due to impaired signaling near the insulin receptor rather than downstream defects.
Fat cells in sedentary people have fewer insulin receptors, so they need much more insulin to start stopping fat breakdown. Once enough insulin is present, they can still fully stop fat breakdown, but the signal from the receptor doesn't start efficiently at low insulin levels because there aren't enough receptors to detect it.
What the research says
1 studyStudy: RELATIONSHIP BETWEEN A SEDENTARY LIFESTYLE AND ADIPOSE INSULIN RESISTANCE.
In inactive people, fat cells need 10 times more insulin to start stopping fat breakdown, but they can still fully stop it if given enough insulin — meaning the problem is that the cell’s 'antenna' (insulin receptor) isn’t working well, not that the inside of the cell can’t respond.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.