I am currently on a diet, but it's really a lifestyle change since I am focusing on proper nutrition for the long run this time!
It sure is a lifestyle change. Proper nutrition is a must since people can only survive without food for up to 40 days. 
Absolutely! I was too accustomed to yo-yo dieting and wrecked my metabolism. But I'm glad I have a proper mindset towards nutrition now. It won't "feel" like a diet.
Yo-yo effect
Yo-yo dieting or yo-yo effect, also known as weight cycling, is a term coined by Kelly D. Brownell at Yale University, in reference to the cyclical loss and gain of weight, resembling the up-down motion of a yo-yo. In this process, the dieter is initially successful in the pursuit of weight loss but is unsuccessful in maintaining the loss long-term and begins to gain the weight back. The dieter then seeks to lose the regained weight, and
self-development. The means of this goal include self purification, thirty two asanas it details for building body strength, twenty five mudras to perfect body steadiness, five means to pratyahara, lessons on proper nutrition and lifestyle, ten types of breathing exercises, three stages of meditation and six types of samadhi.
The text reverentially invokes Hindu god Shiva as well as Vishnu, with verses such as 5.77 and 7.4 suggesting that the writer was also inspired by Advaita Vedanta ideas such as "I am Brahman [Supreme Soul]