Half-Plate Vegetables Rule

Fill half of every main plate with vegetables and fruit, a quarter with whole grains and a quarter with protein.

It is a portion rule rather than a diet: the vegetables crowd the plate before anything else is added.

The protocol

• Half: vegetables and fruit — aim for colour and variety.
• Quarter: whole grains.
• Quarter: fish, poultry, beans or nuts.
• Order: plate the vegetables first, then the rest.
• Potatoes: do not count toward the vegetable half.
• Duration: every main meal for 4 weeks.

What you get

• A visual rule that needs no weighing or counting.
• Shifts the plate toward vegetables and fruit, the pattern linked with lower blood pressure and better heart health.
• Works in a canteen or restaurant as well as at home.

Contraindications

• Chronic kidney disease: potassium in many fruits and vegetables may need limiting — follow the plan set with your clinician or dietitian.
• If you are on a clinician-prescribed diet for any condition, that plan takes precedence over this rule.
• If you have or have had an eating disorder, follow the plan agreed with your care team rather than a self-imposed plate rule.

Evidence level

Medium. The plate layout comes from the Harvard Healthy Eating Plate; it is a pattern-level guide, not a trial of this exact split.

Related protocols

• Sodium Audit — 2 Weeks
• Protein Front-Loading at Breakfast
• Fibre Ramp to 30 g/day

Sources

• Harvard Nutrition Source — Healthy Eating Plate
• Harvard Nutrition Source — Vegetables and fruits
• NIDDK — Healthy eating for adults with chronic kidney disease
• Cleveland Clinic — Eating disorders

AgeGen never invents studies and never recommends prescription drugs by brand. Biohacks are experiments, not prescriptions — honour the contraindications and talk to a clinician if a condition above applies to you.