EVERY January, tonnes of people vow to eat healthier, lose weight, and transform their lifestyles. Often, this means starting a new diet, one that promises rapid results through strict rules and intense restrictions. But time and time again, these diets fail to deliver lasting change. Why? Because restrictive dieting sets us up for a cycle of deprivation, frustration, and rebound weight gain.

“Restrictive diets don’t work, and if you want sustainable results and a healthier relationship with food, they can’t be your go-to,“ says workout developer Mesha Gaye Wright.

She said restrictive diets fail because they create a deprivation mindset, and the moment you tell yourself a food is “off-limits”, it becomes all you can think about.

“Restrictive diets heighten food cravings, making you feel obsessed with what you can’t have. This deprivation often leads to binge-eating episodes, followed by guilt and a renewed commitment to be even stricter, fuelling an unhealthy cycle,“ Wright explained.

She said too that these diets are not sustainable, as cutting out entire food groups, slashing calories, or following overly rigid meal plans may only yield short-term weight loss.

“But they rarely fit into real life. Social events, holidays, busy schedules — they all become obstacles rather than opportunities. Eventually, the rules become too hard to follow, and most people give up,” Wright added.

She warned, too, that diets that cut out food groups can harm your metabolism, and when you chronically under-eat, your body responds by conserving energy.

“Your metabolism slows down, and hunger hormones shift in ways that make you more likely to regain weight, and often more than you originally lost,” Wright said. “This is one of the reasons yo-yo dieting is so common and harmful over time.”

Wright said restrictive diets are built on a one-size-fits-all model, ignoring individual health conditions, activity levels, and food preferences.

“What works for one person might be totally inappropriate for another. Without personalisation, adherence is difficult and results are unpredictable,” she explained. “And even if a diet ‘works’, what happens when it ends? Restrictive plans rarely teach sustainable habits like portion control, mindful eating, or stress management. Without these foundational behaviours, most people return to old patterns once the diet is over.”

WHAT TO DO INSTEAD

If restrictive diets don’t work, what does? The key, Wright says, lies in a more balanced, flexible, and realistic approach to eating and wellness.

So:

Focus on balance, not elimination

Rather than labelling foods as “good” or “bad,” aim for balance. Build meals with a foundation of whole, nutrient-dense foods — vegetables, fruits, lean proteins, whole grains, and healthy fats. But don’t deprive yourself of the occasional treat. When nothing is off-limits, you’re less likely to overdo it.

Build habits, not just willpower

Sustainable change comes from habits, not motivation alone. Small, consistent practices like cooking at home more often, eating without distractions, and checking in with your hunger and fullness levels can have a big impact over time.

Use the 80/20 rule

Try following the 80/20 rule: eat nourishing foods about 80 per cent of the time, and leave 20 per cent for flexibility and enjoyment. This approach allows you to stay on track without feeling deprived, and it fits real life much better than strict dieting.

Support your body — don’t punish it

Instead of fighting your body, work with it. Eat enough to fuel your activity, prioritise sleep and stress management, and stay active in ways you enjoy. These behaviours support your metabolism and overall well-being far more than restriction ever could.

Set realistic, holistic goals

Rather than chasing quick weight loss, aim for goals that improve your quality of life: more energy, better digestion, improved mood, or greater strength. When you focus on how you feel instead of just the number on the scale, your motivation becomes more intrinsic, and more lasting.

“Ditch the all-or-nothing mentality,” Wright said. “Know that one slip-up doesn’t mean you’ve failed. A single indulgent meal or skipped workout is just a moment, not a full stop. Lasting change comes from consistency, not perfection. Practising self-compassion and flexibility will serve you far better than guilt and restriction ever will.“