If you feel like your current diet isn't making you healthier, our friends at Shape [1] consulted creator of the Insanity Workout and host of ABC's My Diet Is Better Than Yours to help you make the switch at the right time.

With his professional-like intensity (or should we say insanity?), Shaun T proves that hard work creates rock-hard results. And now, he's helping people clean up their diets, as the host of ABC's My Diet Is Better Than Yours, which premieres tonight at 9 p.m. EST.

The show pairs contestants with expert trainers who introduce the weight-loss hopefuls to their signature diet and exercise plans. Contestants are challenged to meet fitness milestones along the way, and unlike weight-loss shows before it, My Diet Is Better Than Yours puts the power of elimination in the contestants' hands too. Trainers can be eliminated at any time, ultimately leaving one teacher-student pair victorious at the end. "It's a new twist that I love," says Shaun T. People are finally empowered to find the weight loss plan that works for them. (Have you tried Shaun's 10-Minute Tighten and Tone Circuit [2]?)

Although Shaun T says he encourages contestants to dedicate themselves to their plan — "it takes time for anything to work and show results," he says — finding the best diet for you can definitely take some trial and error.

Here, Shaun T shares some warning signs that your diet could be doing more harm than good — or at very least, flat out isn't working. (And watch out for these 16 Diet Plan Pitfalls That Can Easily Be Prevented [3].)

You hate the food: Eating should be an enjoyable experience! You'll never stick with a diet you dislike.

You're bloated: If the foods on a diet plan are causing inflammation, stomach aches, bloat, or any other GI reactions, it's not worth it.

You're exhausted: If you're feeling tired and sluggish for more than a week, the food you're eating isn't supplying you with enough energy to support your health (let alone a tough workout). Next!

You're irritable: If you're experiencing constant mood swings, it could mean that food choices or portion size is off.

You aren't losing weight: If you haven't dropped even one pound within the first 10 days, something's up. Substantial changes to your diet should show some changes (even minimally) by then.

You're starving: If your diet is restrictive to less than 1,200 calories, and you're hungry. (Cue crankiness and fatigue.) You need nutrients from food to perform everyday tasks, and not eating enough can set you up for internal and external injury. Major don't.

— Alyssa Sparacino

Check out more great stories from Shape:

• The Shape Slim Down Book [4]
• Why You Gain Weight in the Winter [5]
• Does Sugar Really Cause Cancer? [6]