Our weight management specialists break down the pros and cons of some popular diets to help you decide what is the best diet for you.

Author: Sarah Ramage

Published: January 2, 2020 | Updated: March 20, 2025

Estimated reading time: 2 minutes

For those thinking of starting the new year by shedding some pounds to reach a healthier weight, our weight management specialists have broken down some pros and cons to help you decide what is the best diet for you.

Whole30

Pros

  • Increased energy
  • Possible weight loss
  • Possible improved health from identifying foods that cause skin conditions, seasonal allergies or chronic pain
  • Controlled food cravings
  • Improved blood sugar
  • Improved digestion
  • New foods

Cons

  • Requires planning ahead (can be time-consuming)
  • Weight loss and improved health benefits likely temporary unless accompanied by a lifestyle change
  • Very restrictive
  • Cost of some foods
  • Requires tweaking your favorite recipes or finding new ones
  • Difficulty dining out

Recommended for

  • Weight loss
  • Unexplained aches and pains
  • Inflammatory issues
  • Issues regulating blood sugar
  • Issues with digestion

Keto diet

Pros

  • Rapid weight loss
  • Fat burn
  • Potential decrease in seizure activity for people with epilepsy
  • Stabilized blood sugar levels

Cons

  • “Keto flu,” or headache, fatigue, dizziness and nausea
  • Constipation
  • Can be difficult to maintain
  • Potential for increased low-density lipoprotein (LDL) cholesterol and risk for cardiovascular disease

Recommended for

  • People who want to lose weight and will be monitored by a doctor and registered dietitian

Intermittent fasting

Pros

  • Fat burn
  • Weight loss
  • Improved insulin resistance
  • Improved cholesterol

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Cons

  • Getting too hungry, making poor food choices or “giving in”
  • Overeating at mealtimes
  • Short-term weight loss
  • Muscle loss without adequate protein intake and resistance training
  • Digestion issues from eating larger portions
  • Negative change in mood or feeling “hangry”

Not recommended for

  • People with medical conditions such as diabetes or hypoglycemia
  • People who take medication for conditions such as high blood pressure or heart disease
  • People with history of an eating disorder

Carb cycling

Pros

  • Possible weight loss
  • Possible improved athletic performance and reduced muscle breakdown
  • Possible improved function of weight- and appetite-regulating hormones
  • Possible fat burn
  • Possible improved insulin sensitivity

Cons

  • Lack of research
  • Requires tracking your performance and reduced foods to ensure the muscle breakdown correct amount of carbohydrates
  • Degree of difficulty; won’t work if not done correctly (You must follow very closely a specifically planned diet based on a variety of factors related to you and your goals.)

Recommended for

  • Athletes
  • Those wanting to increase muscle
  • Those with specific health goals, since the diet is tailored to the individual