After Double 11, many dieters have likely gone from paying installments to being broke, staring at empty bank accounts and crying into the wind, hoping not to become consumerism's "chives" again during Double 12. Money gone, mood inevitably low—sweets might lift spirits. Yet many dieters avoid sugar, fearing extra carbs will make weight gain even more depressing.
Many believe weight loss requires strict carbohydrate restriction—the less, the better, or even eliminating them entirely. This led to the popularity of low-carb diets. Today, let's explore the truth about low-carb eating.
What is a low-carb diet?
First, from a modern nutritional perspective, carbohydrates are not synonymous with sugar; carbohydrates encompass sugars.When people say "avoid excessive sugar" in daily life, they don't necessarily mean avoiding all sugars.
Currently, there is no precise definition for a low-carb diet. Generally, any diet where carbohydrates make up a smaller proportion than in typical meals is considered low-carb. The 2016 Dietary Guidelines recommend carbohydrates provide over 50% of total calories, while low-carb diets typically limit carbohydrate intake to less than 20%.
Having established the definition of low-carb diets, let's explore their weight loss mechanism.
How do low-carb diets facilitate weight loss?
By limiting carbohydrate intake, insulin levels remain suppressed. When energy is needed, the body utilizes stored reserves (glycogen and fat), leading to gradual weight reduction.
While this sounds logical, does a low-carb diet actually promote weight loss? Let's examine this closely.
Can a low-carb diet help you lose weight?
Yes, absolutely. However, research indicates that the overall weight loss effectiveness of low-carb diets is no more significant than other proven weight loss approaches (such as the Mediterranean diet or low-fat diets).
Additionally, low-carb diets may present several minor challenges.
Low-carb diets are difficult to sustain
Compared to low-fat diets, low-carb diets have poorer adherence and higher dropout rates—especially in China, where carbohydrate-rich foods form the staple diet.In daily life, who skips a bowl of rice or noodles at a meal? Various noodle dishes are regular staples. Long-established eating habits make it hard for many to accept low-carb diets. Therefore, once starting a low-carb diet, people often feel low in mood and motivation, making it difficult to stick with the weight loss effort.
Low-carb diets may increase kidney strain
Low-carb diets shift primary energy sources from carbohydrates to protein and fat. Increased protein intake boosts metabolism, producing more urea that burdens the liver and kidneys. Excessive fat intake may lead to incomplete breakdown, generating ketone acids that further strain the kidneys. Individuals with impaired liver or kidney function should avoid low-carb diets for weight loss.
For weight loss, low-carb diets are indeed viable but require careful attention to nutritional balance and overall health maintenance. While dietary choices matter, the core principle remains controlling total calorie intake.