Original sentence: A 2005 study that imaged the upper hypothalamus for activity with MRI showed no increased activity after aspartame ingestion, suggesting that the sweet taste of aspartame was not causing the brain to start the chain of events that produces insulin.A 2007 study, published in Diabetes Care, that measured blood levels of insulin, found that aspartame causes a spike in insulin level after consumption, inducing a similar rise in glucose and insulin levels at baseline to                  the sucrose meal.This could lead to insulin resistance and possibly type II diabetes
Edited sentence: However, recent studies have shown that aspartame does not increase glucose nor insulin blood levels and cannot be directly linked to insulin resistance or diabetes.If true, this could lead to insulin resistance, weight gain, and possibly type II diabetes -- health outcomes that consumers may be trying to prevent by using diet foods and sodas.Some aspartame critics, particularly those in weight loss communities, claim that aspartame contributes to weight gain and obesity due to purported spikes in the insulin level.The argument holds that aspartame causes the body to secrete excess insulin