Food, part one: subtract the few things that matter

The short version

Cut drinkable calories first: one soda or sweetened drink less per day moves more levers than most diet changes combined. Then pick the single ultra-processed product you eat most often and find a plainer version. After that, flip packages over and read the ingredient list. The seed-oil panic is a distraction you can skip entirely.

There is one move with more upside than anything else in this module. Cut the daily sweet drink. One soda, one glass of OJ, one flavored latte. That single swap touches blood sugar, liver health, weight, and heart risk all at once, because liquid sugar bypasses the satiety signal that solid food triggers. Juice calories arrive; fullness does not.

If you drink two sweetened drinks a day and cut to zero, you have already done the hardest and most useful thing in this module.

Why subtraction comes first

Adding good things to your diet takes effort. Removing one bad thing takes a decision. The research consistently shows that what you cut matters as much as what you add, and the returns come faster. So this module leads with removal, then Module 2 covers what to put in its place.

The four levers here are simple. None require tracking, math, or willpower past the first week.

Start with what you drink

Cut sugary drinks. Soda, juice, sweetened iced tea, and the 400-calorie coffee drinks are all the same problem. They deliver sugar with no fiber to slow it down and no protein to build satiety. Sparkling water with a wedge of citrus is the swap most people stick with. It takes about a week to stop missing the sweetness.

The one-swap rule

One swap for ultra-processed food. You do not need to overhaul your whole diet. Pick the one ultra-processed product you eat most often, and find a plainer version. A 2019 NIH metabolic-ward study had people eat ultra-processed versus minimally processed diets matched for calories, protein, fat, and sugar. The ultra-processed group ate about 500 extra calories per day without intending to. The food itself drove the intake. Swapping your most-eaten UPF product is a concrete, low-friction way to start pulling that lever.

Read the ingredient list, not the label

Read the ingredient list, not the macro panel. The nutrition facts panel tells you calories and macros. The ingredient list tells you what the food actually is. Industrial additives, emulsifiers, modified starch, and "flavouring" are the signature of ultra-processed food. A short list of recognizable ingredients is a reasonable proxy for a less processed product, with a caveat addressed below.

Whole and intact over refined. A whole apple has the same sugars as apple juice, but the fiber in the apple changes the absorption rate, the satiety response, and the glucose curve. Steel-cut oats and instant oat flakes have the same oat on the label. The food matrix, how intact the cellular structure is, changes what your body does with it. Choose the less broken-down version when you have a choice.

What you can stop worrying about

Seed-oil panic. The evidence against canola and sunflower oil is contested. The books most critical of seed oils also warn against single-nutrient thinking. Olive oil is a good default because the evidence for it is strong, full stop.

The "avoid products with more than 5 ingredients" rule. A useful heuristic until it rejects fortified foods. Whole-grain bread fortified with iron and B vitamins might list 7 ingredients. That product is fine. Emulsifiers, carrageenan, and "natural flavours" are better tells than the count.

"Can't pronounce it = bad." Ascorbic acid is vitamin C. Riboflavin is B2. Tocopherol is vitamin E. Chemophobia rejects useful fortification while leaving you confident about products that are ultra-processed.

Calorie counting. You do not need it here. The goal is to shift toward foods that regulate appetite on their own, so you eat less without watching numbers.

Detoxes and cleanses. Your liver and kidneys do this work. Juice cleanses add nothing to that process.

How to actually do this

Start with the drink. Notice which sweetened drink you reach for most often. Tomorrow, replace it once with sparkling water or plain water. Replace it once, then again the day after. The habit tends to stick after about a week.

Once that feels automatic, look at the one ultra-processed food you eat most. A specific brand of crackers, a protein bar, a packaged snack mix. Find a simpler version of the same category. Crackers with four ingredients instead of fourteen. Oats instead of instant flavored packets.

The ingredient list habit comes cheapest. Flip the package over, look at the list. Thirty seconds.

Your one small action for today: check the ingredient list on one product you already have in your kitchen. You are not grading it. You are just starting to see what is in there.

When you are ready, Module 2 covers what to add.

Sources

• Ultra-Processed People, Chris van Tulleken
• In Defense of Food, Michael Pollan
• The Diabetes Code, Jason Fung

For the full evidence base and methodology, see the Science behind GoodEnough page.