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Parkinson’s disease progression: a mutated version of the α-synuclein protein moves through the brain’s lymphatic system, known as the glymphatic system, before aggregating.

The mutated α-synuclein protein propagates through the glymphatic system before forming clumps.

Fluorescent α-synuclein appeared in distant brain areas just two weeks post-injection, showing early propagation

Fibrils of α-synuclein only formed 12 months post-injection, highlighting the delay between propagation and aggregation.

The fibrils are transmitted from neurons to neurons, but it remains unclear whether monomers act in the same way.

A mutated version of a protein called α-synuclein propagates to various cerebral regions through the lymphatic system and then aggregates.

Fluorescent α-synuclein was detected in remote regions two weeks after injection, indicating an early spreading of mutant α-synuclein in the brain. α-synuclein participates in neurotransmission.

However, in some neurodegenerative diseases including Parkinson’s disease, α-synuclein changes shape and forms pathological clumps.

Fluorescent α-synuclein was found in the glymphatic system, which is the lymphatic system of the brain.

The glymphatic system is involved in draining and renewing fluid from the brain and eliminating toxins, but it could also distribute toxic substances throughout the brain.

Fluorescent α-synuclein was found in the matrix surrounding neurons and in the cytosol of neurons. This finding suggested that fluorescent α-synuclein was taken up by the extracellular matrix and, subsequently, by neurons.

Thus, prion-like protein propagation is considered a common pathogenic mechanism in neurodegenerative diseases.

Humans strongly regulate their protein intake, leading to increased consumption, if protein is diluted in their diets. Modern-day processed foods, rich in fats and carbohydrates, dilute protein, prompting people to consume more calories trying to meet their protein needs.

This “protein leverage” mechanism is being identified as a significant factor driving the obesity epidemic. Addressing this requires an integrated approach to understand and combat the multiple interplaying causes of obesity.

Key Facts:Humans have a strong innate drive to regulate protein intake, resulting in increased food consumption when protein is diluted by fats and carbs in processed foods.

Studies show that changing protein requirements across one’s life, combined with lifestyle changes, can increase obesity risk.

Early exposure to high-protein diets, such as through certain infant formulas, might set up increased protein requirements and a greater susceptibility to obesity in later years.

Humans, like many other species, regulate protein intake more strongly than any other dietary component and so if protein is diluted there is a compensatory increase in food intake.

The hypothesis proposes that the dilution of protein in modern-day diets by fat and carbohydrate-rich processed foods is driving increased energy intake as the body seeks to satisfy its natural protein drive—eating unnecessary calories until it does so.

These include, for example, changing requirements for protein at certain life stages (such as the transition to menopause), as well as a combined impact with changes in activity levels or energy expenditure (e.g., retiring athletes or young people moving towards more sedentary lifestyles).

It is only through situating specific nutrients and biological factors within their broader context that we can hope to identify sustainable intervention points for slowing and reversing the incidence of obesity and associated complications.

With WHO declaring obesity as the largest health threat facing humanity, the authors argue that there needs to be a focus on integrative approaches that examine how various contributors interact in obesity, rather than looking at them as competing explanations.

Protein appetite as an integrator in the obesity system: the protein leverage hypothesis, proposes that the dilution of protein in modern food supplies by fat and carbohydrate-rich highly processed foods has resulted in increased energy intake through protein leverage.