A wave of so-called maxxing trends has taken over health content on social media. The concept centers on maximizing or optimizing a specific aspect of health or appearance. Popular versions include proteinmaxxing, fibermaxxing, sleepmaxxing, and fertilitymaxxing. According to Healthline, some of these trends are rooted in healthy habits, but others push people toward extremes or practices not supported by evidence.
Proteinmaxxing and fibermaxxing have become two of the most widely followed nutrition-based versions. Both protein and fiber are essential nutrients, and the most recent Dietary Guidelines for Americans encourage people to prioritize both in their daily diets. But nutrition experts say more is not always better.
"The goal isn't to eat the most protein or fiber; it's to eat the right amount for your unique needs based on your age, gender, physical activity, medical history, labs, etc," said Michelle Routhenstein, preventive cardiology dietitian at Entirely Nourished.
Routhenstein said that focusing on fiber and protein can encourage people to choose nutrient-dense foods that support cardiometabolic health. But she also pointed out that the risks are real when people push their intake too far.
Consuming large amounts of fiber can lead to gas, bloating, constipation, or diarrhea, particularly when intake is increased too quickly. Routhenstein noted that when people experience those symptoms, they sometimes conclude they cannot tolerate fiber at all and cut it out entirely. In most cases, she said, fiber simply needs to be introduced more gradually and adjusted to individual digestive tolerance.
Heavy emphasis on protein carries its own risks. Eating very large amounts of protein can crowd out other nutrient-rich foods, making it harder to get enough fiber, healthy fats, vitamins, minerals, and carbohydrates. Very high protein intakes can also increase fluid needs and may contribute to dehydration and constipation when fiber and hydration are not adequate.
"Start slowly, focus on adding protein and fiber one meal at a time, then adjust over time," Routhenstein said.
Individual protein and fiber needs depend on factors including age, sex, physical activity level, medical history, and lab values. Experts say the evidence does not support a single extreme target that works for everyone.
