Insanity and T25 Diet

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Hi,

I have been doing Insanity and T25 together for the past 4 weeks now. I know its crazy but I found it doable. The problem for me now is that I havent lost any inches off my body for the past 4 weeks. I know the results come in the second week but I did expect atleast some results till now. I have been consuming around 1500 calories everyday and with the workouts the net calories come below 1000. I believe I might be starving myself. I have more endurance for sure but my muscles are more tired. I wanted to know if I should increase my diet and if so then by how much.

I am a 22 year old male, 6'2 and weigh currently 235 pounds

Its getting really frustrating now and I need some help regarding my strategy on going about this.

Thanks for the help in advance.