Can't lose weight no matter how hard i try. i eat 1340 calories a day and workout twice a day for 30 minutes. i have thyroid test and all. any suges?

Good & bad calories: It's not just the calories that count but also the quality of the calories. A low glycemic index diet is the healthiest diet. Definitely eliminate processed foods if you have not already. Consider eliminating gluten & dairy as many people have sensitivities to these proteins. Consider probiotics; new evidence suggests gut health stongly influences weight loss.