Just too add on; consider a can of siet soda containing <150mg of aspartme. When broken down into its constituents you get 75mg phenylalanine, 60mg of L-aspartic acid and 15mg of methanol.

In 100g of steak (small serving) contains we get 1100mg of phenylalanine, 2400mg of l-aspartic acid which is far more than the diet soda.

WRT the methanol, a single apple has ~20-25mg of methanol in it, which is more than a can of diet soda.

Funnly enough, noone ever complains about 'reactions' with apples and steaks like they complainn about aspartme.