Is a calorie deficit diet safe for everyone?

Not necessarily. While a calorie deficit can lead to weight loss for some people, this is mostly in the short-term. For many people it isn’t sustainable in the long-term and for many, these approaches can slow metabolism, increase hunger, and contribute to an unhealthy relationship with food. Additionally it may not be healthy for some people, like those with certain medical conditions and pregnant patients. Many breastfeeding, elderly patients and children should also be cautious about calorie deficits.

Repeated cycles of dieting and regaining weight, also known as weight cycling or “yo-yo dieting,” are often worse for overall health. Everyone’s calorie needs and body responses are different, and what works short term may not support long-term wellbeing and can alter your body’s response to calorie intake and diets in the future.

For personalized guidance on weight management, it’s best to consult a registered dietitian or healthcare practitioner rather than relying on calorie targets alone.