Brief Answer:
Vary exercises and stick to healthy wholesome food

Detailed Answer:
Hello,

Welcome to HCM and thank you for the query.
This plateau effect ,when one goes on a diet program, is commonly noticed.
The reason for this is that the Basal Metabolic Rate (BMR) of the body which is one of the main burners of the calories we consume, slows down. As a result even with less calorie intake the body maintains the weight.
Doing a 30-minute walk on a treadmill or in the neighborhood gets your body into a groove. After a while, your muscles get used to the routine and become very efficient at doing the task at hand. Vary your physical activity. For example, during your 30-minute treadmill session, include higher speed minutes. Sustain this higher intensity for a few minutes, and then return to your comfort level. After you recover, do it again and again. This will help you burn more calories . Strength-training exercises (like weight lifting) help counteract muscle loss from age and dieting . Building and preserving muscle mass is a key factor in reaching a healthy weight, as muscle burn more calories than fat. Also increase your activities by incorporating exercise into daily life. Climb stairs instead of riding the lift. When you climb it is like carrying your weight and walking and climbing stairs is a very good calorie burner.
A lot of attention is required on the food front also. Take a small plate and put on it a small helping of low calorie wholesome food and eat slowly chewing well. Choose mainly vegetables and fruits. Take at least 20 minutes to eat what you have got on your plate. It takes 20 minutes for your satiety center in the brain to be stimulated and to know that you have eaten.
Visualise yourself as a lean muscular person and strive to achieve it. There may a few set backs but never let these put you down or dilute your resolution.
Don't give in to stress and use food as a stress reliever. Learn and practice yoga. Studies show that yoga lowers levels of stress hormones and increases insulin sensitivity ,making your body burn food as fuel rather than store it as fat.
With all these I am sure you would be able to blast through the plateau and achieve your goal.
Best wishes,
Dr Noble XXXXXXX

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Brief Answer:
Yes

Detailed Answer:
Yes, High intensity interval training and low calorie wholesome diet is the answer.
High intensity training races your heart. So before you start, you should see your doctor and get a clearance for high intensity training.
Take Care

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