High fat diet (more than 25 % of total daily calorie intake) can cause blood sugar swings, which triggers pancreas to produce excessive insulin. (nutriplanet.org)
A high quality cat food will contain between 20 - 40 % fat (essential fatty acids) of total daily calorie intake. (thedrakecenter.com)
The general recommendation is one gram of protein per pound of body weight and 20 % of total daily calories coming from fat. (fitnessandpower.com)